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Sequential Immunization with Universal Live Attenuated Influenza Vaccine Candidates Protects Ferrets against a High-Dose Heterologous Virus Challenge

Identifieur interne : 000F96 ( Ncbi/Merge ); précédent : 000F95; suivant : 000F97

Sequential Immunization with Universal Live Attenuated Influenza Vaccine Candidates Protects Ferrets against a High-Dose Heterologous Virus Challenge

Auteurs : Irina Isakova-Sivak [Russie] ; Victoria Matyushenko [Russie] ; Tatiana Kotomina [Russie] ; Irina Kiseleva [Russie] ; Elena Krutikova [Russie] ; Svetlana Donina [Russie] ; Andrey Rekstin [Russie] ; Natalia Larionova [Russie] ; Daria Mezhenskaya [Russie] ; Konstantin Sivak [Russie] ; Arman Muzhikyan [Russie] ; Anastasia Katelnikova [Russie] ; Larisa Rudenko [Russie]

Source :

RBID : PMC:6789596

Abstract

The development of universal influenza vaccines has been a priority for more than 20 years. We conducted a preclinical study in ferrets of two sets of live attenuated influenza vaccines (LAIVs) expressing chimeric hemagglutinin (cHA). These vaccines contained the HA stalk domain from H1N1pdm09 virus but had antigenically unrelated globular head domains from avian influenza viruses H5N1, H8N4 and H9N2. The viral nucleoproteins (NPs) in the two sets of universal LAIV candidates were from different sources: one LAIV set contained NP from A/Leningrad/17 master donor virus (MDV), while in the other set this gene was from wild-type (WT) H1N1pdm09 virus, in order to better match the CD8 T-cell epitopes of currently circulating influenza A viruses. To avoid any difference in protective effect of the various anti-neuraminidase (NA) antibodies, all LAIVs were engineered to contain the NA gene of Len/17 MDV. Naïve ferrets were sequentially immunized with three doses of (i) classical LAIVs containing non-chimeric HA and NP from MDV (LAIVs (NP-MDV)); (ii) cHA-based LAIVs containing NP from MDV (cHA LAIVs (NP-MDV)); and (iii) cHA-based LAIVs containing NP from H1N1pdm09 virus (cHA LAIVs (NP-WT)). All vaccination regimens were safe, producing no significant increase in body temperature or weight loss, in comparison with the placebo group. The two groups of cHA-based vaccines induced a broadly reactive HA stalk-directed antibody, while classical LAIVs did not. A high-dose challenge with H1N1pdm09 virus induced significant pathology in the control, non-immunized ferrets, including high virus titers in respiratory tissues, clinical signs of disease and histopathological changes in nasal turbinates and lung tissues. All three vaccination regimens protected animals from clinical manifestations of disease: immunized ferrets did not lose weight or show clinical symptoms, and their fever was significantly lower than in the control group. Further analysis of virological and pathological data revealed the following hierarchy in the cross-protective efficacy of the vaccines: cHA LAIVs (NP-WT) > cHA LAIVs (NP-MDV) > LAIVs (NP-MDV). This ferret study showed that prototype universal cHA-based LAIVs are highly promising candidates for further clinical development.


Url:
DOI: 10.3390/vaccines7030061
PubMed: 31288422
PubMed Central: 6789596

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PMC:6789596

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<name sortKey="Mezhenskaya, Daria" sort="Mezhenskaya, Daria" uniqKey="Mezhenskaya D" first="Daria" last="Mezhenskaya">Daria Mezhenskaya</name>
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<name sortKey="Katelnikova, Anastasia" sort="Katelnikova, Anastasia" uniqKey="Katelnikova A" first="Anastasia" last="Katelnikova">Anastasia Katelnikova</name>
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<name sortKey="Rudenko, Larisa" sort="Rudenko, Larisa" uniqKey="Rudenko L" first="Larisa" last="Rudenko">Larisa Rudenko</name>
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<p>The development of universal influenza vaccines has been a priority for more than 20 years. We conducted a preclinical study in ferrets of two sets of live attenuated influenza vaccines (LAIVs) expressing chimeric hemagglutinin (cHA). These vaccines contained the HA stalk domain from H1N1pdm09 virus but had antigenically unrelated globular head domains from avian influenza viruses H5N1, H8N4 and H9N2. The viral nucleoproteins (NPs) in the two sets of universal LAIV candidates were from different sources: one LAIV set contained NP from A/Leningrad/17 master donor virus (MDV), while in the other set this gene was from wild-type (WT) H1N1pdm09 virus, in order to better match the CD8 T-cell epitopes of currently circulating influenza A viruses. To avoid any difference in protective effect of the various anti-neuraminidase (NA) antibodies, all LAIVs were engineered to contain the NA gene of Len/17 MDV. Naïve ferrets were sequentially immunized with three doses of (i) classical LAIVs containing non-chimeric HA and NP from MDV (LAIVs (NP-MDV)); (ii) cHA-based LAIVs containing NP from MDV (cHA LAIVs (NP-MDV)); and (iii) cHA-based LAIVs containing NP from H1N1pdm09 virus (cHA LAIVs (NP-WT)). All vaccination regimens were safe, producing no significant increase in body temperature or weight loss, in comparison with the placebo group. The two groups of cHA-based vaccines induced a broadly reactive HA stalk-directed antibody, while classical LAIVs did not. A high-dose challenge with H1N1pdm09 virus induced significant pathology in the control, non-immunized ferrets, including high virus titers in respiratory tissues, clinical signs of disease and histopathological changes in nasal turbinates and lung tissues. All three vaccination regimens protected animals from clinical manifestations of disease: immunized ferrets did not lose weight or show clinical symptoms, and their fever was significantly lower than in the control group. Further analysis of virological and pathological data revealed the following hierarchy in the cross-protective efficacy of the vaccines: cHA LAIVs (NP-WT) > cHA LAIVs (NP-MDV) > LAIVs (NP-MDV). This ferret study showed that prototype universal cHA-based LAIVs are highly promising candidates for further clinical development.</p>
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</TEI>
<pmc article-type="research-article">
<pmc-dir>properties open_access</pmc-dir>
<front>
<journal-meta>
<journal-id journal-id-type="nlm-ta">Vaccines (Basel)</journal-id>
<journal-id journal-id-type="iso-abbrev">Vaccines (Basel)</journal-id>
<journal-id journal-id-type="publisher-id">vaccines</journal-id>
<journal-title-group>
<journal-title>Vaccines</journal-title>
</journal-title-group>
<issn pub-type="epub">2076-393X</issn>
<publisher>
<publisher-name>MDPI</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="pmid">31288422</article-id>
<article-id pub-id-type="pmc">6789596</article-id>
<article-id pub-id-type="doi">10.3390/vaccines7030061</article-id>
<article-id pub-id-type="publisher-id">vaccines-07-00061</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Article</subject>
</subj-group>
</article-categories>
<title-group>
<article-title>Sequential Immunization with Universal Live Attenuated Influenza Vaccine Candidates Protects Ferrets against a High-Dose Heterologous Virus Challenge</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<contrib-id contrib-id-type="orcid" authenticated="true">https://orcid.org/0000-0002-2801-1508</contrib-id>
<name>
<surname>Isakova-Sivak</surname>
<given-names>Irina</given-names>
</name>
<xref ref-type="aff" rid="af1-vaccines-07-00061">1</xref>
<xref rid="c1-vaccines-07-00061" ref-type="corresp">*</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Matyushenko</surname>
<given-names>Victoria</given-names>
</name>
<xref ref-type="aff" rid="af1-vaccines-07-00061">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Kotomina</surname>
<given-names>Tatiana</given-names>
</name>
<xref ref-type="aff" rid="af1-vaccines-07-00061">1</xref>
</contrib>
<contrib contrib-type="author">
<contrib-id contrib-id-type="orcid" authenticated="true">https://orcid.org/0000-0002-3892-9873</contrib-id>
<name>
<surname>Kiseleva</surname>
<given-names>Irina</given-names>
</name>
<xref ref-type="aff" rid="af1-vaccines-07-00061">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Krutikova</surname>
<given-names>Elena</given-names>
</name>
<xref ref-type="aff" rid="af1-vaccines-07-00061">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Donina</surname>
<given-names>Svetlana</given-names>
</name>
<xref ref-type="aff" rid="af1-vaccines-07-00061">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Rekstin</surname>
<given-names>Andrey</given-names>
</name>
<xref ref-type="aff" rid="af1-vaccines-07-00061">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Larionova</surname>
<given-names>Natalia</given-names>
</name>
<xref ref-type="aff" rid="af1-vaccines-07-00061">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Mezhenskaya</surname>
<given-names>Daria</given-names>
</name>
<xref ref-type="aff" rid="af1-vaccines-07-00061">1</xref>
</contrib>
<contrib contrib-type="author">
<contrib-id contrib-id-type="orcid" authenticated="true">https://orcid.org/0000-0003-4064-5033</contrib-id>
<name>
<surname>Sivak</surname>
<given-names>Konstantin</given-names>
</name>
<xref ref-type="aff" rid="af2-vaccines-07-00061">2</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Muzhikyan</surname>
<given-names>Arman</given-names>
</name>
<xref ref-type="aff" rid="af2-vaccines-07-00061">2</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Katelnikova</surname>
<given-names>Anastasia</given-names>
</name>
<xref ref-type="aff" rid="af3-vaccines-07-00061">3</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Rudenko</surname>
<given-names>Larisa</given-names>
</name>
<xref ref-type="aff" rid="af1-vaccines-07-00061">1</xref>
</contrib>
</contrib-group>
<aff id="af1-vaccines-07-00061">
<label>1</label>
Department of Virology, Institute of Experimental Medicine, St Petersburg 197376, Russia</aff>
<aff id="af2-vaccines-07-00061">
<label>2</label>
Department of Preclinical Trials, Smorodintsev Research Institute of Influenza, St Petersburg 197376, Russia</aff>
<aff id="af3-vaccines-07-00061">
<label>3</label>
Department of Toxicology and Microbiology, Institute of Preclinical Research Ltd., St Petersburg 188663, Russia</aff>
<author-notes>
<corresp id="c1-vaccines-07-00061">
<label>*</label>
Correspondence:
<email>isakova.sivak@iemspb.ru</email>
; Tel.: +7-812-234-4292</corresp>
</author-notes>
<pub-date pub-type="epub">
<day>08</day>
<month>7</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="collection">
<month>9</month>
<year>2019</year>
</pub-date>
<volume>7</volume>
<issue>3</issue>
<elocation-id>61</elocation-id>
<history>
<date date-type="received">
<day>22</day>
<month>5</month>
<year>2019</year>
</date>
<date date-type="accepted">
<day>04</day>
<month>7</month>
<year>2019</year>
</date>
</history>
<permissions>
<copyright-statement>© 2019 by the authors.</copyright-statement>
<copyright-year>2019</copyright-year>
<license license-type="open-access">
<license-p>Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/4.0/">http://creativecommons.org/licenses/by/4.0/</ext-link>
).</license-p>
</license>
</permissions>
<abstract>
<p>The development of universal influenza vaccines has been a priority for more than 20 years. We conducted a preclinical study in ferrets of two sets of live attenuated influenza vaccines (LAIVs) expressing chimeric hemagglutinin (cHA). These vaccines contained the HA stalk domain from H1N1pdm09 virus but had antigenically unrelated globular head domains from avian influenza viruses H5N1, H8N4 and H9N2. The viral nucleoproteins (NPs) in the two sets of universal LAIV candidates were from different sources: one LAIV set contained NP from A/Leningrad/17 master donor virus (MDV), while in the other set this gene was from wild-type (WT) H1N1pdm09 virus, in order to better match the CD8 T-cell epitopes of currently circulating influenza A viruses. To avoid any difference in protective effect of the various anti-neuraminidase (NA) antibodies, all LAIVs were engineered to contain the NA gene of Len/17 MDV. Naïve ferrets were sequentially immunized with three doses of (i) classical LAIVs containing non-chimeric HA and NP from MDV (LAIVs (NP-MDV)); (ii) cHA-based LAIVs containing NP from MDV (cHA LAIVs (NP-MDV)); and (iii) cHA-based LAIVs containing NP from H1N1pdm09 virus (cHA LAIVs (NP-WT)). All vaccination regimens were safe, producing no significant increase in body temperature or weight loss, in comparison with the placebo group. The two groups of cHA-based vaccines induced a broadly reactive HA stalk-directed antibody, while classical LAIVs did not. A high-dose challenge with H1N1pdm09 virus induced significant pathology in the control, non-immunized ferrets, including high virus titers in respiratory tissues, clinical signs of disease and histopathological changes in nasal turbinates and lung tissues. All three vaccination regimens protected animals from clinical manifestations of disease: immunized ferrets did not lose weight or show clinical symptoms, and their fever was significantly lower than in the control group. Further analysis of virological and pathological data revealed the following hierarchy in the cross-protective efficacy of the vaccines: cHA LAIVs (NP-WT) > cHA LAIVs (NP-MDV) > LAIVs (NP-MDV). This ferret study showed that prototype universal cHA-based LAIVs are highly promising candidates for further clinical development.</p>
</abstract>
<kwd-group>
<kwd>universal influenza vaccine</kwd>
<kwd>chimeric hemagglutinin</kwd>
<kwd>nucleoprotein</kwd>
<kwd>live attenuated influenza vaccine</kwd>
<kwd>sequential immunization</kwd>
<kwd>ferret model</kwd>
</kwd-group>
</article-meta>
</front>
<floats-group>
<fig id="vaccines-07-00061-f001" orientation="portrait" position="float">
<label>Figure 1</label>
<caption>
<p>Overview of the LAIV viruses used in this study. (
<bold>A</bold>
) Schematic representation of the chimeric HA protein structure. (
<bold>B</bold>
) Genome composition of the LAIV reassortant viruses rescued in this study.</p>
</caption>
<graphic xlink:href="vaccines-07-00061-g001"></graphic>
</fig>
<fig id="vaccines-07-00061-f002" orientation="portrait" position="float">
<label>Figure 2</label>
<caption>
<p>Overview of study design (
<bold>A</bold>
) and designation of the study groups (
<bold>B</bold>
).</p>
</caption>
<graphic xlink:href="vaccines-07-00061-g002"></graphic>
</fig>
<fig id="vaccines-07-00061-f003" orientation="portrait" position="float">
<label>Figure 3</label>
<caption>
<p>Safety of sequential immunization of ferrets. (
<bold>A</bold>
) Percentage body weight change. (
<bold>B</bold>
) Area under the curve of delta T relative to baseline temperature for each ferret over the immunization phase. (
<bold>C</bold>
) Scores for clinical signs of influenza infection in ferrets throughout the immunization period. No significant differences were observed for any of the parameters.</p>
</caption>
<graphic xlink:href="vaccines-07-00061-g003"></graphic>
</fig>
<fig id="vaccines-07-00061-f004" orientation="portrait" position="float">
<label>Figure 4</label>
<caption>
<p>Replication of LAIV viruses in the upper respiratory tract of immunized ferrets after the first (
<bold>A</bold>
), second (
<bold>B</bold>
) and third (
<bold>C</bold>
) vaccine dose.</p>
</caption>
<graphic xlink:href="vaccines-07-00061-g004"></graphic>
</fig>
<fig id="vaccines-07-00061-f005" orientation="portrait" position="float">
<label>Figure 5</label>
<caption>
<p>HAI antibody immune responses in immunized ferrets measured against a panel of viruses. (
<bold>A</bold>
) H5 NP/MDV LAIV. (
<bold>B</bold>
) H8 NP/MDV LAIV. (
<bold>C</bold>
) H9 NP/MDV LAIV. (
<bold>D</bold>
) A/herring gull/Sarma/51/2006 (H6N1) wild-type virus. (
<bold>E</bold>
) cH11/1N1 LAIV virus bearing chimeric HA gene (the HA stalk domain of Cal09 and the HA head domain of A/northern shoveler/Netherlands/18/99 (H11N9)) and the NA gene of Cal09. (
<bold>F</bold>
) A/South Africa/3626/2013 (pH1N1) wild-type virus. The HAI titers for H5 and H8 antigens were determined using horse red blood cells; the remaining antigens were tested with chicken RBCs. * indicates significant difference with the mock-vaccinated group. The dashed line indicates the limit of detection.</p>
</caption>
<graphic xlink:href="vaccines-07-00061-g005"></graphic>
</fig>
<fig id="vaccines-07-00061-f006" orientation="portrait" position="float">
<label>Figure 6</label>
<caption>
<p>Cross-reactivity of the induced antibody responses. Serum IgG endpoint antibody titers in immunized ferrets were measured by ELISA against: H5 NP/MDV LAIV whole virus antigen (
<bold>A</bold>
); H8 full-length HA protein (
<bold>B</bold>
); H9 full-length HA protein (
<bold>C</bold>
); H3 full-length HA protein (
<bold>D</bold>
); H6 full-length HA protein (
<bold>E</bold>
); pH1N1 whole virus antigen (
<bold>F</bold>
); cH6/1 chimeric HA protein (
<bold>G</bold>
); and long alpha helix 1 (LAH1) recombinant protein (
<bold>H</bold>
). * indicates significant difference with the mock-vaccinated group. The dashed line indicates the limit of detection.</p>
</caption>
<graphic xlink:href="vaccines-07-00061-g006"></graphic>
</fig>
<fig id="vaccines-07-00061-f007" orientation="portrait" position="float">
<label>Figure 7</label>
<caption>
<p>Neutralizing activity of the induced antibody responses. Broadly neutralizing antibody responses in immunized ferrets were measured in 50% microneutralization test (MNT
<sub>50</sub>
) against: H5 NP/MDV LAIV virus (
<bold>A</bold>
); H8 NP/MDV LAIV (
<bold>B</bold>
); H9 NP/MDV LAIV (
<bold>C</bold>
); A/South Africa/3626/2013 (pH1N1) virus (
<bold>D</bold>
); and cH11/1N1 LAIV virus (
<bold>E</bold>
). * indicates significant difference with the mock-vaccinated group. The dashed line indicates the limit of detection.</p>
</caption>
<graphic xlink:href="vaccines-07-00061-g007"></graphic>
</fig>
<fig id="vaccines-07-00061-f008" orientation="portrait" position="float">
<label>Figure 8</label>
<caption>
<p>Replication of H1N1pdm09 challenge virus in respiratory tract of immunized ferrets. (
<bold>A</bold>
) Virus titers in nasal wash fluids at each time point during the challenge phase and the AUC of NFW viral titers for individual ferrets. (
<bold>B</bold>
) Viral titers in trachea. (
<bold>C</bold>
) Viral titers in lungs. * indicates significant difference with mock-vaccinated group (Mann-Whitney U test).</p>
</caption>
<graphic xlink:href="vaccines-07-00061-g008"></graphic>
</fig>
<fig id="vaccines-07-00061-f009" orientation="portrait" position="float">
<label>Figure 9</label>
<caption>
<p>Clinical signs of influenza infection in immunized ferrets after challenge. (
<bold>A</bold>
) Dynamics of body weight change during the challenge phase. (
<bold>B</bold>
) Area under the curve of percentage body weight change for each ferret. (
<bold>C</bold>
) Sum of scores for clinical signs for each ferret during the four days after the challenge. * Significant difference from the mock-vaccinated group (Mann-Whitney U test).</p>
</caption>
<graphic xlink:href="vaccines-07-00061-g009"></graphic>
</fig>
<fig id="vaccines-07-00061-f010" orientation="portrait" position="float">
<label>Figure 10</label>
<caption>
<p>Body temperature of immunized ferrets after challenge. (
<bold>A</bold>
) Variation in body temperature over the challenge phase. The several sharp decreases in temperature are the result of sedation during challenge (D63) and collection of nasal wash fluids. (
<bold>B</bold>
) Maximal increase in body temperature over the challenge phase. (
<bold>C</bold>
) Area under the curve of delta T relative to baseline temperature for each ferret over the challenge phase. Statistical differences with mock-vaccinated group are indicated (Mann-Whitney U test); ns = not significant.</p>
</caption>
<graphic xlink:href="vaccines-07-00061-g010"></graphic>
</fig>
<fig id="vaccines-07-00061-f011" orientation="portrait" position="float">
<label>Figure 11</label>
<caption>
<p>Pathology of the upper respiratory tract of immunized ferrets four days post-challenge. (
<bold>A</bold>
) Gross pathology (GP) of nasal turbinates (upper panel). Histopathology of NT (middle panel) and trachea (lower panel). (
<bold>B</bold>
) Percentage affected nasal turbinate tissues. (
<bold>C</bold>
) Semi-quantitative analysis of NT infection pathology. H&E—haematoxylin and eosin. AB—alcian blue. Statistical differences with mock-vaccinated group are indicated (Mann-Whitney U test); ns = not significant.</p>
</caption>
<graphic xlink:href="vaccines-07-00061-g011"></graphic>
</fig>
<fig id="vaccines-07-00061-f012" orientation="portrait" position="float">
<label>Figure 12</label>
<caption>
<p>Pathology of the lower respiratory tract of immunized ferrets four days post-challenge. (
<bold>A</bold>
) Gross pathology (GP) of ferrets’ lungs (upper panel). Histopathology of lungs with different dyes (middle and lower panels). (
<bold>B</bold>
) Percentage affected lung tissues. (
<bold>C</bold>
) Semi-quantitative analysis of lung infection pathology. H&E—haematoxylin and eosin. P-M—picro-Mallory stain. Statistical differences with the mock-vaccinated group are indicated (Mann-Whitney U test); ns = not significant.</p>
</caption>
<graphic xlink:href="vaccines-07-00061-g012"></graphic>
</fig>
<table-wrap id="vaccines-07-00061-t001" orientation="portrait" position="float">
<object-id pub-id-type="pii">vaccines-07-00061-t001_Table 1</object-id>
<label>Table 1</label>
<caption>
<p>Virological characteristics of LAIV viruses used in this study.</p>
</caption>
<table frame="hsides" rules="groups">
<thead>
<tr>
<th rowspan="2" align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" colspan="1">LAIV Virus</th>
<th colspan="3" align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" rowspan="1">Virus Titer in Eggs, log
<sub>10</sub>
EID
<sub>50</sub>
/mL</th>
<th rowspan="2" align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" colspan="1">Phenotype</th>
<th rowspan="2" align="center" valign="middle" style="border-top:solid thin;border-bottom:solid thin" colspan="1">Virus Titer in MDCK Cells, log
<sub>10</sub>
TCID
<sub>50</sub>
/mL</th>
</tr>
<tr>
<th align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">33 °C</th>
<th align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">38 °C</th>
<th align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">26 °C</th>
</tr>
</thead>
<tbody>
<tr>
<td align="center" valign="middle" rowspan="1" colspan="1">H5 NP/MDV</td>
<td align="center" valign="middle" rowspan="1" colspan="1">9.2 ± 0.3</td>
<td align="center" valign="middle" rowspan="1" colspan="1">2.7 ± 0.5</td>
<td align="center" valign="middle" rowspan="1" colspan="1">6.5 ± 0.7</td>
<td align="center" valign="middle" rowspan="1" colspan="1">
<italic>ts/ca</italic>
</td>
<td align="center" valign="middle" rowspan="1" colspan="1">8.6 ± 0.3</td>
</tr>
<tr>
<td align="center" valign="middle" rowspan="1" colspan="1">H8 NP/MDV</td>
<td align="center" valign="middle" rowspan="1" colspan="1">7.6 ± 0.8</td>
<td align="center" valign="middle" rowspan="1" colspan="1">1.6 ± 0.2</td>
<td align="center" valign="middle" rowspan="1" colspan="1">5.5 ± 0.4</td>
<td align="center" valign="middle" rowspan="1" colspan="1">
<italic>ts/ca</italic>
</td>
<td align="center" valign="middle" rowspan="1" colspan="1">6.0 ± 0.8</td>
</tr>
<tr>
<td align="center" valign="middle" rowspan="1" colspan="1">H9 NP/MDV</td>
<td align="center" valign="middle" rowspan="1" colspan="1">8.4 ± 0.5</td>
<td align="center" valign="middle" rowspan="1" colspan="1">1.7 ± 0.6</td>
<td align="center" valign="middle" rowspan="1" colspan="1">5.5 ± 0.8</td>
<td align="center" valign="middle" rowspan="1" colspan="1">
<italic>ts/ca</italic>
</td>
<td align="center" valign="middle" rowspan="1" colspan="1">7.4 ± 0.5</td>
</tr>
<tr>
<td align="center" valign="middle" rowspan="1" colspan="1">cH5 NP/MDV</td>
<td align="center" valign="middle" rowspan="1" colspan="1">8.6 ± 0.3</td>
<td align="center" valign="middle" rowspan="1" colspan="1">2.2 ± 0.5</td>
<td align="center" valign="middle" rowspan="1" colspan="1">6.3 ± 0.1</td>
<td align="center" valign="middle" rowspan="1" colspan="1">
<italic>ts/ca</italic>
</td>
<td align="center" valign="middle" rowspan="1" colspan="1">7.3 ± 0.3
<sup></sup>
</td>
</tr>
<tr>
<td align="center" valign="middle" rowspan="1" colspan="1">cH8 NP/MDV</td>
<td align="center" valign="middle" rowspan="1" colspan="1">7.7 ± 0.7</td>
<td align="center" valign="middle" rowspan="1" colspan="1">1.2 ± 0.2</td>
<td align="center" valign="middle" rowspan="1" colspan="1">5.1 ± 0.9</td>
<td align="center" valign="middle" rowspan="1" colspan="1">
<italic>ts/ca</italic>
</td>
<td align="center" valign="middle" rowspan="1" colspan="1">5.8 ± 0.4
<sup></sup>
</td>
</tr>
<tr>
<td align="center" valign="middle" rowspan="1" colspan="1">cH9 NP/MDV</td>
<td align="center" valign="middle" rowspan="1" colspan="1">8.9 ± 0.4</td>
<td align="center" valign="middle" rowspan="1" colspan="1">2.0 ± 0.6</td>
<td align="center" valign="middle" rowspan="1" colspan="1">6.5 ± 0.7</td>
<td align="center" valign="middle" rowspan="1" colspan="1">
<italic>ts/ca</italic>
</td>
<td align="center" valign="middle" rowspan="1" colspan="1">8.2 ± 0.0</td>
</tr>
<tr>
<td align="center" valign="middle" rowspan="1" colspan="1">cH5 NP/WT</td>
<td align="center" valign="middle" rowspan="1" colspan="1">7.5 ± 0.4
<sup></sup>
</td>
<td align="center" valign="middle" rowspan="1" colspan="1">1.5 ± 0.4</td>
<td align="center" valign="middle" rowspan="1" colspan="1">3.0 ± 0.3</td>
<td align="center" valign="middle" rowspan="1" colspan="1">
<italic>ts/non-ca</italic>
</td>
<td align="center" valign="middle" rowspan="1" colspan="1">6.4 ± 0.4
<sup></sup>
</td>
</tr>
<tr>
<td align="center" valign="middle" rowspan="1" colspan="1">cH8 NP/WT</td>
<td align="center" valign="middle" rowspan="1" colspan="1">8.1 ± 0.7</td>
<td align="center" valign="middle" rowspan="1" colspan="1">2.2 ± 0.8</td>
<td align="center" valign="middle" rowspan="1" colspan="1">5.2 ± 0.7</td>
<td align="center" valign="middle" rowspan="1" colspan="1">
<italic>ts/ca</italic>
</td>
<td align="center" valign="middle" rowspan="1" colspan="1">7.0 ± 0.2</td>
</tr>
<tr>
<td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">cH9 NP/WT</td>
<td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">7.8 ± 0.7</td>
<td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">2.1 ± 0.4</td>
<td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">5.2 ± 0.8</td>
<td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">
<italic>ts/ca</italic>
</td>
<td align="center" valign="middle" style="border-bottom:solid thin" rowspan="1" colspan="1">5.2 ± 0.3
<sup></sup>
</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn>
<p>
<sup></sup>
<italic>p</italic>
< 0.05 compared with the corresponding control LAIV virus with classical HA and NP from MDV.
<sup></sup>
<italic>p</italic>
< 0.05 compared with the cH8 NP/WT LAIV.</p>
</fn>
</table-wrap-foot>
</table-wrap>
</floats-group>
</pmc>
<affiliations>
<list>
<country>
<li>Russie</li>
</country>
</list>
<tree>
<country name="Russie">
<noRegion>
<name sortKey="Isakova Sivak, Irina" sort="Isakova Sivak, Irina" uniqKey="Isakova Sivak I" first="Irina" last="Isakova-Sivak">Irina Isakova-Sivak</name>
</noRegion>
<name sortKey="Donina, Svetlana" sort="Donina, Svetlana" uniqKey="Donina S" first="Svetlana" last="Donina">Svetlana Donina</name>
<name sortKey="Katelnikova, Anastasia" sort="Katelnikova, Anastasia" uniqKey="Katelnikova A" first="Anastasia" last="Katelnikova">Anastasia Katelnikova</name>
<name sortKey="Kiseleva, Irina" sort="Kiseleva, Irina" uniqKey="Kiseleva I" first="Irina" last="Kiseleva">Irina Kiseleva</name>
<name sortKey="Kotomina, Tatiana" sort="Kotomina, Tatiana" uniqKey="Kotomina T" first="Tatiana" last="Kotomina">Tatiana Kotomina</name>
<name sortKey="Krutikova, Elena" sort="Krutikova, Elena" uniqKey="Krutikova E" first="Elena" last="Krutikova">Elena Krutikova</name>
<name sortKey="Larionova, Natalia" sort="Larionova, Natalia" uniqKey="Larionova N" first="Natalia" last="Larionova">Natalia Larionova</name>
<name sortKey="Matyushenko, Victoria" sort="Matyushenko, Victoria" uniqKey="Matyushenko V" first="Victoria" last="Matyushenko">Victoria Matyushenko</name>
<name sortKey="Mezhenskaya, Daria" sort="Mezhenskaya, Daria" uniqKey="Mezhenskaya D" first="Daria" last="Mezhenskaya">Daria Mezhenskaya</name>
<name sortKey="Muzhikyan, Arman" sort="Muzhikyan, Arman" uniqKey="Muzhikyan A" first="Arman" last="Muzhikyan">Arman Muzhikyan</name>
<name sortKey="Rekstin, Andrey" sort="Rekstin, Andrey" uniqKey="Rekstin A" first="Andrey" last="Rekstin">Andrey Rekstin</name>
<name sortKey="Rudenko, Larisa" sort="Rudenko, Larisa" uniqKey="Rudenko L" first="Larisa" last="Rudenko">Larisa Rudenko</name>
<name sortKey="Sivak, Konstantin" sort="Sivak, Konstantin" uniqKey="Sivak K" first="Konstantin" last="Sivak">Konstantin Sivak</name>
</country>
</tree>
</affiliations>
</record>

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