Filariasis in Japan Some 25 Years after its Eradication
Identifieur interne : 004658 ( Pmc/Corpus ); précédent : 004657; suivant : 004659Filariasis in Japan Some 25 Years after its Eradication
Auteurs : Eisaku Kimura ; Makoto ItohSource :
- Tropical Medicine and Health [ 1348-8945 ] ; 2011.
Url:
DOI: 10.2149/tmh.39-1-suppl_2-57
PubMed: 22028603
PubMed Central: 3153153
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PMC:3153153Le document en format XML
<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Filariasis in Japan Some 25 Years after its Eradication</title><author><name sortKey="Kimura, Eisaku" sort="Kimura, Eisaku" uniqKey="Kimura E" first="Eisaku" last="Kimura">Eisaku Kimura</name><affiliation><nlm:aff id="aff1">Department of Parasitology, Aichi Medical University School of Medicine, Nagakute, Aichi-ken 480-1195, Japan.</nlm:aff></affiliation></author><author><name sortKey="Itoh, Makoto" sort="Itoh, Makoto" uniqKey="Itoh M" first="Makoto" last="Itoh">Makoto Itoh</name><affiliation><nlm:aff id="aff2">Department of Parasitology, Aichi Medical University School of Medicine, Nagakute, Aichi-ken 480-1195, Japan.</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">22028603</idno><idno type="pmc">3153153</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3153153</idno><idno type="RBID">PMC:3153153</idno><idno type="doi">10.2149/tmh.39-1-suppl_2-57</idno><date when="2011">2011</date><idno type="wicri:Area/Pmc/Corpus">004658</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">004658</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Filariasis in Japan Some 25 Years after its Eradication</title><author><name sortKey="Kimura, Eisaku" sort="Kimura, Eisaku" uniqKey="Kimura E" first="Eisaku" last="Kimura">Eisaku Kimura</name><affiliation><nlm:aff id="aff1">Department of Parasitology, Aichi Medical University School of Medicine, Nagakute, Aichi-ken 480-1195, Japan.</nlm:aff></affiliation></author><author><name sortKey="Itoh, Makoto" sort="Itoh, Makoto" uniqKey="Itoh M" first="Makoto" last="Itoh">Makoto Itoh</name><affiliation><nlm:aff id="aff2">Department of Parasitology, Aichi Medical University School of Medicine, Nagakute, Aichi-ken 480-1195, Japan.</nlm:aff></affiliation></author></analytic><series><title level="j">Tropical Medicine and Health</title><idno type="ISSN">1348-8945</idno><idno type="eISSN">1349-4147</idno><imprint><date when="2011">2011</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Hatano, K" uniqKey="Hatano K">K Hatano</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Sasa, M" uniqKey="Sasa M">M Sasa</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Fukushima, H" uniqKey="Fukushima H">H Fukushima</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Yoshida, C" uniqKey="Yoshida C">C Yoshida</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Fukumoto, H" uniqKey="Fukumoto H">H 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Trop Med Health</journal-id><journal-id journal-id-type="publisher-id">TMH</journal-id><journal-title-group><journal-title>Tropical Medicine and Health</journal-title></journal-title-group><issn pub-type="ppub">1348-8945</issn><issn pub-type="epub">1349-4147</issn><publisher><publisher-name>The Japanese Society of Tropical Medicine</publisher-name><publisher-loc>Nagasaki, Japan</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">22028603</article-id><article-id pub-id-type="pmc">3153153</article-id><article-id pub-id-type="publisher-id">tmh-39-1-suppl_2-57</article-id><article-id pub-id-type="doi">10.2149/tmh.39-1-suppl_2-57</article-id><article-categories><subj-group subj-group-type="heading"><subject>Original Article</subject></subj-group></article-categories><title-group><article-title>Filariasis in Japan Some 25 Years after its Eradication</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Kimura</surname><given-names>Eisaku</given-names></name><xref ref-type="aff" rid="aff1">1</xref><xref ref-type="corresp" rid="cor1"></xref></contrib><contrib contrib-type="author"><name><surname>Itoh</surname><given-names>Makoto</given-names></name><xref ref-type="aff" rid="aff2">2</xref><xref ref-type="corresp" rid="cor2"></xref></contrib></contrib-group><aff id="aff1"><label>1</label>Department of Parasitology, Aichi Medical University School of Medicine, Nagakute, Aichi-ken 480-1195, Japan.</aff><aff id="aff2"><label>2</label>Department of Parasitology, Aichi Medical University School of Medicine, Nagakute, Aichi-ken 480-1195, Japan.</aff><author-notes><corresp id="cor1">E-mail: <email>kimura@aichi-med-u.ac.jp</email></corresp><corresp id="cor2">E-mail: <email>macitoh@aichi-med-u.ac.jp</email></corresp></author-notes><pub-date pub-type="ppub"><month>3</month><year>2011</year></pub-date><volume>39</volume><issue>1 Suppl 2</issue><fpage>57</fpage><lpage>63</lpage><permissions><copyright-statement>© 2011 Japanese Society of Tropical Medicine</copyright-statement><copyright-year>2011</copyright-year><license license-type="open-access"><license-p>This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p></license></permissions></article-meta></front><body><sec sec-type=""><title>1 Introduction</title><p>Japan is said to have eradicated filariasis some 25 years ago, but the exact time (and even the definition of eradication) is not clear. However, the results of successful control programs clearly indicate that the number of microfilaria carriers had been reduced to a very low level long before the “eradication”. As filariasis disappeared, the once stigmatized disease quickly lost clinical significance. At the same time, the number of parasitologists and researchers interested in filariasis dwindled quickly to only a handful in the whole country 10-15 years after the disappearance. Filariasis problems in Japan still remain as sequelae of the old infection. However, young clinicians have little knowledge of filariasis, and the rare, localized and non-lethal disease is disappearing also from the memory of doctors. On the other hand, some doctors continue to encounter cases of lymphedema, hydrocele and chyluria. Some of these are diagnosed as filarial in origin, and in most cases the diagnosis is based on the fact that the patients were born and brought up in the past endemic areas. Practically, there is no reliable way of diagnosing the old clinical filariasis. Some immunodiagnostic methods are available but they are not very specific.</p><p>The purpose of this review is to describe what is happening with filariasis in Japan about 25 years after its eradication. The review will highlight the situation of chyluria, the most common sequela, and its treatment, recent filarial infections in Japan including imported cases and zoonotic filariasis, and immunodiagnostic methods used for suspected clinical filariasis.</p></sec><sec sec-type=""><title>2 When did filariasis disappear from Japan?</title><p>In starting this review it will be necessary to address the question of when filariasis was “eradicated” in Japan. Experts agree that it disappeared sometime in the late 1970s, but nobody can pinpoint the exact year. It would seem that the filarial infection disappeared before anyone started to worry about the definition of eradication, or evaluation criteria for eradication. Thus, it is likely that little room was left for precise research on the “specific day” in the final stage of mop-up. The government of Japan initiated, in 1962, the National Filariasis Control Program in parts of Kyushu, Shikoku and Tokyo (Izu Islands) mainly based on chemotherapy with diethylcarbamazine (DEC). The program was very successful, and the number of microfilaria carriers decreased quickly. In a low-endemic area of Ehime prefecture (microfilaria rate: 1.01% in 1961), no microfilaremic case was detected by 1967 (Hatano, 1986) [<xref ref-type="bibr" rid="B1">1</xref>], though Sasa (1976) [<xref ref-type="bibr" rid="B2">2</xref>] recorded the last cases in 1969. In Kagoshima prefecture, the microfilaria rate of 6.6% in 1962 came down to 0 in 1975 (Fukushima, 1998) [<xref ref-type="bibr" rid="B3">3</xref>]. In highly endemic Okinawa, the former Ryukyu that was under U.S. occupation from 1945 to 1972, the eradication program was started in 1965 with the assistance of the U.S. Civil Administration of the Ryukyu Islands and the Japanese government. The last microfilaria carrier was reported there in 1978 (Yoshida, 1988) [<xref ref-type="bibr" rid="B4">4</xref>].</p><p>For the confirmation of microfilaremia at a low level, the nuclepore-filtration method with 1 ml of venous blood was introduced in 1979 at Bonotsu-cho, Kagoshima prefecture (Fukumoto, 1984) [<xref ref-type="bibr" rid="B5">5</xref>], and in 1980 at Kuroshima, Okinawa (Tada <italic>et al.</italic>, 1982) [<xref ref-type="bibr" rid="B6">6</xref>]. No microfilaria-positive person was detected in these studies. However, Teruya <italic>et al.</italic> (1982) [<xref ref-type="bibr" rid="B7">7</xref>] wrote that two microfilaria carriers were reported after 1980 in Okinawa. Itoh <italic>et al.</italic> (1999) [<xref ref-type="bibr" rid="B8">8</xref>] reported one chyluria patient who showed a high level of filaria-specific IgG4, suggesting that adult worms had been surviving until recent years.</p><p>In conclusion, microfilaria carriers disappeared from Japan, most probably in the early 1980s. It was possible that adult worms, which are pathogenic, survived for some more years.</p></sec><sec sec-type=""><title>3 Chyluria</title><sec><title>3.1 Occurrence of clinical cases after the interruption of filarial transmission</title><p>The number of case reports on chyluria in Japan is limited. We encountered only 14 full papers and 14 abstracts of oral presentations since 1982 by screening Igaku-Chuo-Zasshi (Japana Centra Revuo Medicina), which is the Japanese equivalent of Index Medicus, covering most medical and related journals published in Japan and records of medical conferences/meetings. A majority of case reports are made by doctors working in non- (or low-) endemic areas of Japan, where the disease is considered very rare, and therefore worthy of reporting. It is of interest to note that most reports mentioned Okinawa or Kyushu as a place of birth or residence of patients, suggesting that a history of residence in the past endemic areas is a key for the diagnosis of filarial origin.</p><p>Amami Oshima, Kagoshima prefecture (Kyushu) used to have a high prevalence of filariasis (microfilaria rate in 1962: 10.3%). It is interesting to look at what happened to clinical cases after filariasis transmission ceased completely. The clinical statistical data from the Urology Section of Kagoshima Prefectural Oshima Hospital will be informative in this regard (Kawahara <italic>et al.</italic>, 1992; Kubo <italic>et al.</italic>, 1992) [<xref ref-type="bibr" rid="B9">9</xref>, <xref ref-type="bibr" rid="B10">10</xref>]. The yearly number of chyluria, scrotal elephantiasis and hydrocele cases from 1981 to 1990 is shown in Table <xref ref-type="table" rid="T1">1</xref> for outpatients and inpatients. During the 10 year-period, there were 15,225 outpatients, of which 382 cases (2.5%) had chyluria, 13 (0.09%) had scrotal elephantiasis and 527 (3.5%) had hydrocele testis. It is interesting to note that the annual occurrence of chyluria (30-45 cases) and hydrocele (38-64 cases) was almost the same during the 10 years, while the number of scrotal elephantiasis cases seemed to decrease (though not conclusive). For inpatients, the situation was basically the same. Among 1,701 inpatients in the 10-year period, chyluria and hydrocele accounted for 60 (3.5%) and 79 (4.6%) cases respectively, and there was no decrease in the occurrence by year. The authors specifically commented that newly-developed chyluria cases were encountered at a rate of about one case per month 10 years after the filariasis eradication. Contrary to this comment, Fukumoto (1984) [<xref ref-type="bibr" rid="B5">5</xref>], at Bonotsu-cho, Kagoshima prefecture, reported a steady decrease in elephantiasis, hydrocele and chyluria cases as the filariasis control program progressed. In 1965, there were 43 (4.0%) clinical cases out of 1,064 examined, which decreased to 5 cases (0.8%) out of 640 in 1980, and all of these 5 cases were people aged 54-75 years. (Note: The numbers examined (1,064 and 640) are an estimate made by the present reviewers.)</p><p>What will be the reasons for the continuing occurrence of new chyluria cases many years after the interruption of filarial transmission? There would be three possibilities: (1) permanent damage to the lymphatic tissues left by filarial infection was activated or worsened by bacterial infections, injuries, pregnancies, tumors, etc; (2) adult worms could survive longer than expected and continued damaging the lymphatic system; and (3) non-filarial chyluria might be incorrectly included in counting. With regard to the first possibility, there are some supporting reports: A case of chyluria was reported cured simply by treatment for concurrent renal tuberculosis (Kawakami <italic>et al.</italic>, 1998) [<xref ref-type="bibr" rid="B11">11</xref>]. On the contrary, the treatment of tuberculosis was followed by fresh chyluria in another case (Nakao and Shiotani, 1985) [<xref ref-type="bibr" rid="B12">12</xref>], suggesting interaction between the two diseases. Koga <italic>et al.</italic> (1982) [<xref ref-type="bibr" rid="B13">13</xref>] reported that of 155 chyluria cases, 85 had complications of various types, the most common being genitourinal (71 cases), and that the treatment of complications alone improved chyluria in 59.5% of those treated. In other cases, chyluria started during pregnancy (Mandai <italic>et al.</italic>. 1990) [<xref ref-type="bibr" rid="B14">14</xref>] and was complicated with non-active adrenal tumor (Takeichi <italic>et al.</italic>, 1989) [<xref ref-type="bibr" rid="B15">15</xref>].</p><p>The second possibility is supported by two facts: the very long life span of adult worms (up to 40 years!) (Carme and Laigret, 1979) [<xref ref-type="bibr" rid="B16">16</xref>], and the persistence of circulating filaria antigens, products of live adult worms, for years even after treatment had cleared microfilaremia (Zheng <italic>et al.</italic>, 1990) [<xref ref-type="bibr" rid="B17">17</xref>].</p><p>The third possibility is without evidence. However, as the diagnosis of filarial chyluria is sometimes based simply on a history of residence in endemic areas, or a simplified criterion like “no obstruction of the thoracic duct is indicative of filarial chyluria,” misdiagnosis could indeed occur.</p></sec><sec><title>3.2 Does chyluria cause immunological incompetence?</title><p>Tamaki (1984) [<xref ref-type="bibr" rid="B18">18</xref>] showed that the number of peripheral T lymphocytes was significantly lower in chyluria patients than in healthy controls. The T cell reduction was particularly evident during the aggravation stage of chyluria (Fig. <xref ref-type="fig" rid="F1">1</xref>). Also, <sup>3</sup>H-thymidine uptake by lymphocytes after phytohemagglutinin (PHA) stimulation revealed significantly lower uptake in chyluria patients. Koga <italic>et al.</italic> (1985) [<xref ref-type="bibr" rid="B19">19</xref>] reported that lymphopenia was observed in 63 of 124 (50.8%) chyluria patients, and Koyama <italic>et al.</italic> (1990) [<xref ref-type="bibr" rid="B20">20</xref>] showed a clear inhibition of PHA-induced blast formation of lymphocytes among chyluria cases.</p><p>With regard to decreased cellular immunity, some reports suggested a higher occurrence of malignancies among filarial chyluria patients. For example, Koyama <italic>et al.</italic> (1989) [<xref ref-type="bibr" rid="B21">21</xref>] reported 26 malignancies out of 162 chyluria cases (16%) in Okinawa which was more than 25 times higher than the national average. Such observations have to be analyzed carefully, because malignancies could be the cause of chyluria. When chyluria patients were divided into 2 groups according to the positivity of toxoplasmosis indirect hemagglutination test (IHA), the IHA positive group had a significantly lower number of peripheral lymphocytes and T cells (Tamaki, 1984) [<xref ref-type="bibr" rid="B18">18</xref>]. A chyluria case with lymphopenia and reduced CD4+ cells complicated with cryptococcal infection was also reported (Honda <italic>et al.</italic>, 2003) [<xref ref-type="bibr" rid="B22">22</xref>].</p><p>With regard to <italic>W. bancrofti</italic> infection (not necessarily to chyluria), a positive relationship between antibody levels to filarial antigen and positive rates of antibodies to adult T-cell leukemia (ATL) virus-associated antigen was reported (Tajima <italic>et al.</italic>, 1983; Fujita <italic>et al.</italic>, 1986) [<xref ref-type="bibr" rid="B23">23</xref>, <xref ref-type="bibr" rid="B24">24</xref>]. It was supposed that filariae exerted a promoting effect on ATL virus infection and proliferation.</p></sec><sec><title>3.3 Treatments of chyluria</title><p>The treatments for chyluria employed in Japan after 1980 are basically the same classical methods: intrarenal pelvic instillation with silver nitrate (mostly 0.1-0.5%) by means of catheterization and then, if required, renal lymph vessel occlusion (Katamine, 1966) [<xref ref-type="bibr" rid="B25">25</xref>] or stripping and interruption (ligation) of the renal pedicle lymphatics. Of 47 cases reported at various institutions in Japan between 1984 and 2003, silver nitrate only was used in 15 cases. Six cases needed renal operation as the silver nitrate treatment was not successful. Ten cases were deemed to need surgery from the beginning. The operation, renal lymph vessel occlusion, is said to be very effective and safe (Okamoto and Ohi, 1983) [<xref ref-type="bibr" rid="B26">26</xref>]. However, a report by Takigawa <italic>et al.</italic> (1988) [<xref ref-type="bibr" rid="B27">27</xref>] showed a possibility of severe adverse reaction after the operation. A 57-year-old male suffered from renal arterial thrombosis after bilateral stripping and ligation, which resulted in complete loss of left renal function. Apparently, this rare operation provided a good subject for case reports and thus accounts for a large proportion of reported treatments. Treatments with low-fat diet and lymphangiography were also reported.</p><p>Several new attempts were made to treat chyluria. A 50-year-old woman received bilateral inguinal lymph nodesaphenous vein anastomosis and right inguinal lymphangiovenous anastomosis (Muguruma <italic>et al.</italic>, 1994) [<xref ref-type="bibr" rid="B28">28</xref>]. The chyluria disappeared within 5 months after operation. The procedure, which had been tested successfully in China was recommended as an effective, simple and less invasive surgical method, suitable for aged patients. Endoscopic coagulation was utilized in 5 chyluria cases (Yagi <italic>et al.</italic>, 1998) [<xref ref-type="bibr" rid="B29">29</xref>]. No recurrence occurred among the patients during the 16-34 month-period of observation.</p></sec></sec><sec sec-type=""><title>4 Other clinical manifestations of bancroftian filariasis in Japan</title><p>Hydrocele used to be more common than chyluria in endemic areas (Katamine, 1966) [<xref ref-type="bibr" rid="B25">25</xref>]. The cases recorded at the Kagoshima Prefectural Oshima Hospital accounted for 3.5% of the total number of outpatients, and did not decrease during the 1981-1990 period (Kubo <italic>et al.</italic> 1992) [<xref ref-type="bibr" rid="B10">10</xref>]. However, it is interesting to find that hydrocele is rarely mentioned in relation to filarial infection in recent studies. Even Kubo <italic>et al.</italic> above, dealt with hydrocele separately from filariasis in their statistics. This is probably because of difficulty in determining the true cause of this clinical condition. Only 2 full papers (Sakurai <italic>et al.</italic>, 1985; Matsui <italic>et al.</italic>, 1995) [<xref ref-type="bibr" rid="B30">30</xref>, <xref ref-type="bibr" rid="B31">31</xref>] and 3 abstracts on “filarial” hydrocele are found, including 11 cases. Suspecting filarial origin, Maeda <italic>et al.</italic> (2000) [<xref ref-type="bibr" rid="B32">32</xref>] mentioned that around 15 new hydrocele cases per year visited their hospital in Miyakojima, Okinawa.</p><p>Acquired lymphangioma of the scrotum, or lymphoscrotum, is a rare condition observed in lymphatic filariasis. Multiple papules, whitish to reddish in color, appear on the scrotal skin. They break easily and discharge often milky lymph fluid. Hagiwara <italic>et al.</italic> (1994) [<xref ref-type="bibr" rid="B33">33</xref>] compiled 6 cases of filarial lymphangioma, including lymphoscrotum and lesions on the vulva and penis. After 1994, 7 more cases were reported, 6 of which were treated successfully by resection of the affected lesion and a subsequent skin graft (Hannita <italic>et al.</italic>, 1997; Takahata <italic>et al.</italic>, 1998) [<xref ref-type="bibr" rid="B34">34</xref>, <xref ref-type="bibr" rid="B35">35</xref>]. Yet another patient, who discharged more than 2,000 ml of lymph per day at one point, was treated with an anti-platelet drug, cilostazol, and showed clinical improvement (Masuzawa <italic>et al.</italic>, 2001)[<xref ref-type="bibr" rid="B36">36</xref>].</p></sec><sec sec-type=""><title>5 Imported cases of filariasis</title><p>The first loiasis case in Japan was reported in 1985 (Tani <italic>et al.</italic>, 1985) [<xref ref-type="bibr" rid="B37">37</xref>]. The patient was a 33-year-old male German, who had traveled for 2 months in Africa. Fugitive swelling was observed and microfilariae were positive, showing diurnal periodicity The second case was a 53-year-old Japanese man who had lived in Zaire. An adult worm was removed from the right ocular conjunctiva. Microfilariae were also positive (Ohtaki <italic>et al.</italic>, 1988; Kamikawatoko <italic>et al.</italic>, 1989) [<xref ref-type="bibr" rid="B38">38</xref>, <xref ref-type="bibr" rid="B39">39</xref>]. The third case, reported in 1997, was a 28-year-old Gabonese male. Microfilariae were positive and a moving adult worm was noticed in the conjunctiva (Yara <italic>et al.</italic>, 2001) [<xref ref-type="bibr" rid="B40">40</xref>]. A 29-year-old male Nigerian case was reported in 1998 (Yasuki <italic>et al.</italic>, 1998) [<xref ref-type="bibr" rid="B41">41</xref>]. Adult worm was found moving in a conjunctival nodule and removed surgically. No microfilaria was found. Additionally, a 32-year-old Japanese woman, who had traveled in more than 40 countries in Africa was reported as a loiasis patient without parasitological confirmation (Yoshikawa <italic>et al.</italic>, 2003) [<xref ref-type="bibr" rid="B42">42</xref>]. She experienced a subcutaneous nodule that showed repeated appearance and disappearance at intervals of about a week. The ELISA with <italic>Dirofilaria immitis</italic> antigen was positive. Yet another Japanese case was reported in 1984, but without confirmation.</p><p>The first <italic>Dipetalonema perstans</italic> infection was reported in a 34-year-old Japanese man who had worked in Zaire for a study on chimpanzees (Yoshida <italic>et al.</italic>, 1983) [<xref ref-type="bibr" rid="B43">43</xref>]. A subcutaneous nodule was noticed, and microfilariae were positive in the blood. These were unsheathed and did not show periodicity. The second case was also a Japanese researcher on primates, a 40-year-old male, who had worked in Cameroon (Hioki <italic>et al.</italic>, 1986) [<xref ref-type="bibr" rid="B44">44</xref>]. A 28-year-old male Nigerian with microfilariae was diagnosed as having <italic>D. perstans</italic> infection (Iiyama <italic>et al.</italic>, 2000) [<xref ref-type="bibr" rid="B45">45</xref>].</p><p><italic>Onchocerca volvulus</italic> infection was reported in a Japanese man (34 years) who had lived in Guinea, Gabon and Jordan (Yoshimura, 1983) [<xref ref-type="bibr" rid="B46">46</xref>]. A subcutaneous nodule was observed on the left buttock. The nodule was removed surgically and the pathological sections revealed an <italic>O. volvulus</italic> adult female.</p><p>A Japanese case of tropical pulmonary eosinophilia (52-year-old male) was reported (Oyamada <italic>et al.</italic>, 1995) [<xref ref-type="bibr" rid="B47">47</xref>]. The patient, who had worked in Vietnam for about 3 years, experienced chest pain, wheezing, pleural effusion, eoshinophilia (59%), high serum IgE (708 IU) and positive antibody test against <italic>D. immitis</italic> antigen. DEC and steroid elicited a swift improvement. A Sri Lanlcan case, 21 year-old male, of tropical pulmonary eosinophilia was reported by Hayashi <italic>et al.</italic> (1996) [<xref ref-type="bibr" rid="B48">48</xref>].</p><p>Microfilariae of <italic>Wuchereria bancrofti</italic> and <italic>Brugia malayi</italic> were found in the hydrocele fluid of a 27-year-old Chinese man (1990) and a 36-year-old Sri Lankan man (1996), respectively. The latter case seems to be very rare, as it is generally believed that hydrocele associates with <italic>W. bancrofti</italic>, not <italic>B. malayi.</italic></p></sec><sec sec-type=""><title>6 Zoonotic onchocerciasis in Japan</title><p><italic>D. immitis</italic> infection of humans, which will be reviewed separately by Akao (Akao N. this issue: 65-71), is an important zoonotic filariasis in Japan. In addition, zoonotic onchocercal infections were reported in Oita prefecture, Kyu-shu. The first case was a 2-year-old girl with subcutaneous swelling on the sole of the left foot (Hashimoto <italic>et al.</italic>, 1990) [<xref ref-type="bibr" rid="B49">49</xref>]. Biopsy specimens revealed a mature female parasite that was suspected to be <italic>O. gutturosa </italic>or <italic>O. cervicalis</italic> (Beaver <italic>et al.</italic>, 1989) [<xref ref-type="bibr" rid="B50">50</xref>]. Two more cases were reported from Oita prefecture: A 57-year-old woman with a painful nodule on the wrist was suspected to be infected with <italic>O. gutturosa</italic> (Takaoka <italic>et al.</italic>, 1996) [<xref ref-type="bibr" rid="B51">51</xref>], and a 52-year-old woman with subcutaneous swelling on the left retroauricular region was diagnosed as having a new subspecies, <italic>O. dewittei japonica</italic> (Takaoka <italic>et al.</italic>, 2001) [<xref ref-type="bibr" rid="B52">52</xref>]. The authors raised the possibility that the 57-year-old case, was in fact <italic>O. dewittei japonica</italic> infection.</p></sec><sec sec-type=""><title>7 Immunodiagnoses</title><p>Without active filariasis in Japan, the definite diagnosis of filarial chyluria, hydrocele and lymphedema/elephantiasis is difficult and is therefore made by exclusion. The diagnosis of filariasis is often made or suspected when the cases are of old age and brought up in previously endemic areas. To distinguish filarial and non-filarial chyluria, several papers stress the importance of thoracic duct obstruction, the absence being evidence of filarial chyluria. Often, immunodiagnoses are the only way to discern past filarial infections. A gel double diffusion test and ELISAs, including dot ELISA, have been employed most frequently to detect antifilarial antibodies.</p><p>In most reports, anti-filarial antibodies were detected using <italic>D. immitis</italic> antigens. In zoonotic human onchocerciasis cases, ELISA was carried out with <italic>O. volvulus</italic> or <italic>O. gutturosa</italic> antigens (Takaoka <italic>et al.,</italic> 1996; Korenaga <italic>et al.</italic>, 1983) [<xref ref-type="bibr" rid="B51">51</xref>, <xref ref-type="bibr" rid="B53">53</xref>]. In suspected bancroftian filariasis, the Department of Parasitology, Aichi Medical University has used, on request, Og4C3 ELISA or ICT card tests to detect <italic>W. bancrofti</italic> antigen and ELISA to detect filaria-specific IgG4. With the aim of detecting old infections, Itoh <italic>et al.</italic> (1999) [<xref ref-type="bibr" rid="B8">8</xref>] developed an IgG ELISA using <italic>B. pahangi</italic> adult female antigens. The ELISA was tested with microfilaria positives from Sri Lanka (positive control), normal Japanese (negative control), and 16 chyluria patients who were born and brought up in Okinawa. In order to increase specificity, sample sera were absorbed with several species of nematode antigens. The absorption with <italic>Anisakis</italic> larval antigens and <italic>D. immitis</italic> antigens produced satisfactory results (Fig. <xref ref-type="fig" rid="F2">2</xref>). With this ELISA, 5 of 16 chyluria cases were considered filarial. As for lymphedema cases, 34 suspected patients were examined between 1996 and June 2003, at the request of clinicians. A high IgG4 titer was obtained from 1 person aged 82 years, and high IgG titers from 3 persons.</p></sec></body><back><ack><title>Acknowledgement</title><p>This paper is revised from Asian Parasitology Vol. 3 Filariasis in Asia and Western Pacific Islands, 137-144 by The Federation of Asian Parasitologists in 2004.</p></ack><ref-list><title>References</title><p>(Paper titles with * are translated from Japanese by the present reviewers)</p><ref id="B1"><label>1</label><mixed-citation publication-type="other" publisher-type="book"><person-group person-group-type="author"><name><surname>Hatano</surname><given-names>K</given-names></name></person-group> editor. 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<volume>32</volume>: <fpage>347</fpage>-<lpage>355</lpage></mixed-citation></ref></ref-list></back><floats-group><fig id="F1" orientation="portrait" position="float"><label>Fig. 1.</label><caption><p>Comparison of T cell counts.</p><p>A: Control, B: Chyluria cases during aggravation, C: Chyluria cases in remission [Quoted from Tamaki, Trop Med [<xref ref-type="bibr" rid="B18">18</xref>]]</p></caption><graphic xlink:href="tmh-39-1-suppl_2-57-g001"></graphic></fig><fig id="F2" orientation="portrait" position="float"><label>Fig. 2.</label><caption><p>Anti-<italic>B. pahangi</italic> IgG antibodies in serum samples. The samples were absorbed with <italic>D. immitis</italic> and/or <italic>Anisakis</italic> sp. antigens [Quoted from Itoh <italic>et al.</italic>, Jpn J Trop Med Hyg [<xref ref-type="bibr" rid="B8">8</xref>]]</p><p>Serum samples without absorption (A). Samples absorbed with <italic>D. immitis</italic> antigens (B), <italic>Anisakis</italic> antigens (C), and both <italic>D. immitis</italic> and <italic>Anisakis</italic> antigens (D). Left column: chyluria patients, Middle column: Japanese healthy controls, Right column: Sri Lankan microfilaria positives.</p><p>Short horizontal bar: the mean of antibody titers. The means were compared before (A) and after absorption (B, C, D) with <italic>t</italic>-test; * for p<0.05, ** for p<0.0l. An arrow in panel (D) indicates a cut-off point.</p></caption><graphic xlink:href="tmh-39-1-suppl_2-57-g002"></graphic></fig><table-wrap id="T1" orientation="portrait" position="float"><label>Table 1:</label><caption><p>The number of possible clinical filariasis registered at Kagoshima Prefectural Oshima Hospital in 1981-1990</p></caption><table frame="hsides" rules="groups"><thead><tr><th rowspan="1" colspan="1"></th><th align="center" rowspan="1" colspan="1">1981</th><th align="center" rowspan="1" colspan="1">1982</th><th align="center" rowspan="1" colspan="1">1983</th><th align="center" rowspan="1" colspan="1">1984</th><th align="center" rowspan="1" colspan="1">1985</th><th align="center" rowspan="1" colspan="1">1986</th><th align="center" rowspan="1" colspan="1">1987</th><th align="center" rowspan="1" colspan="1">1988</th><th align="center" rowspan="1" colspan="1">1989</th><th align="center" rowspan="1" colspan="1">1990</th><th align="center" rowspan="1" colspan="1">Total</th></tr></thead><tbody><tr><td align="left" rowspan="1" colspan="1">Outpatients (n=15225*)</td><td align="center" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td align="left" rowspan="1" colspan="1"> Chyluria</td><td align="center" rowspan="1" colspan="1">43</td><td align="center" rowspan="1" colspan="1">31</td><td align="center" rowspan="1" colspan="1">36</td><td align="center" rowspan="1" colspan="1">43</td><td align="center" rowspan="1" colspan="1">40</td><td align="center" rowspan="1" colspan="1">38</td><td align="center" rowspan="1" colspan="1">38</td><td align="center" rowspan="1" colspan="1">38</td><td align="center" rowspan="1" colspan="1">30</td><td align="center" rowspan="1" colspan="1">45</td><td align="center" rowspan="1" colspan="1">382</td></tr><tr><td align="left" rowspan="1" colspan="1"> Scrotalelephantiasis</td><td align="center" rowspan="1" colspan="1">1</td><td align="center" rowspan="1" colspan="1">1</td><td align="center" rowspan="1" colspan="1">5</td><td align="center" rowspan="1" colspan="1">2</td><td align="center" rowspan="1" colspan="1">1</td><td align="center" rowspan="1" colspan="1">2</td><td align="center" rowspan="1" colspan="1">0</td><td align="center" rowspan="1" colspan="1">1</td><td align="center" rowspan="1" colspan="1">0</td><td align="center" rowspan="1" colspan="1">0</td><td align="center" rowspan="1" colspan="1">13</td></tr><tr><td align="left" rowspan="1" colspan="1"> Hydrocele testis</td><td align="center" rowspan="1" colspan="1">49</td><td align="center" rowspan="1" colspan="1">38</td><td align="center" rowspan="1" colspan="1">44</td><td align="center" rowspan="1" colspan="1">57</td><td align="center" rowspan="1" colspan="1">51</td><td align="center" rowspan="1" colspan="1">62</td><td align="center" rowspan="1" colspan="1">54</td><td align="center" rowspan="1" colspan="1">61</td><td align="center" rowspan="1" colspan="1">64</td><td align="center" rowspan="1" colspan="1">47</td><td align="center" rowspan="1" colspan="1">527</td></tr><tr><td colspan="12" rowspan="1"><hr></hr></td></tr><tr><td align="left" rowspan="1" colspan="1">Inpatients (n=1701*)</td><td align="center" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td align="left" rowspan="1" colspan="1"> Chyluria</td><td align="center" rowspan="1" colspan="1">7</td><td align="center" rowspan="1" colspan="1">7</td><td align="center" rowspan="1" colspan="1">4</td><td align="center" rowspan="1" colspan="1">7</td><td align="center" rowspan="1" colspan="1">6</td><td align="center" rowspan="1" colspan="1">11</td><td align="center" rowspan="1" colspan="1">1</td><td align="center" rowspan="1" colspan="1">3</td><td align="center" rowspan="1" colspan="1">3</td><td align="center" rowspan="1" colspan="1">11</td><td align="center" rowspan="1" colspan="1">60</td></tr><tr><td align="left" rowspan="1" colspan="1"> Hydrocele testis</td><td align="center" rowspan="1" colspan="1">6</td><td align="center" rowspan="1" colspan="1">7</td><td align="center" rowspan="1" colspan="1">7</td><td align="center" rowspan="1" colspan="1">13</td><td align="center" rowspan="1" colspan="1">6</td><td align="center" rowspan="1" colspan="1">10</td><td align="center" rowspan="1" colspan="1">4</td><td align="center" rowspan="1" colspan="1">5</td><td align="center" rowspan="1" colspan="1">7</td><td align="center" rowspan="1" colspan="1">14</td><td align="center" rowspan="1" colspan="1">79</td></tr></tbody></table><table-wrap-foot><p>* The number of patients in 1981-1990. [Quoted from Kawahara <italic>et al.</italic> Nishinihon J Urology [<xref ref-type="bibr" rid="B9">9</xref>] and Kubo <italic>et al.</italic> Nishinihon J Urology [<xref ref-type="bibr" rid="B9">9</xref>]]</p></table-wrap-foot></table-wrap></floats-group></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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