Serveur d'exploration H2N2

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Population Serologic Immunity to Human and Avian H2N2 Viruses in the United States and Hong Kong for Pandemic Risk Assessment

Identifieur interne : 000011 ( 1957/Analysis ); précédent : 000010; suivant : 000012

Population Serologic Immunity to Human and Avian H2N2 Viruses in the United States and Hong Kong for Pandemic Risk Assessment

Auteurs : Tara M. Babu [États-Unis] ; Ranawaka A P M. Perera ; Joseph T. Wu ; Theresa Fitzgerald [États-Unis] ; Carolyn Nolan [États-Unis] ; Benjamin J. Cowling ; Scott Krauss [États-Unis] ; John J. Treanor [États-Unis] ; Malik Peiris

Source :

RBID : PMC:6107991

Descripteurs français

English descriptors

Abstract

AbstractBackground

Influenza A pandemics cause significant mortality and morbidity. H2N2 viruses have caused a prior pandemic, and are circulating in avian reservoirs. The age-related frequency of current population immunity to H2 viruses was evaluated.

Methods

Hemagglutinin inhibition (HAI) assays against historical human and recent avian influenza A(H2N2) viruses were performed across age groups in Rochester, New York, and Hong Kong, China. The impact of existing cross-reactive HAI immunity on the effective reproduction number was modeled.

Results

One hundred fifty individual sera from Rochester and 295 from Hong Kong were included. Eighty-five percent of patients born in Rochester and Hong Kong before 1968 had HAI titers ≥1:40 against A/Singapore/1/57, and >50% had titers ≥1:40 against A/Berkeley/1/68. The frequency of titers ≥1:40 to avian H2N2 A/mallard/England/727/06 and A/mallard/Netherlands/14/07 in subjects born before 1957 was 62% and 24%, respectively. There were no H2 HAI titers >1:40 in individuals born after 1968. These levels of seroprevalence reduce the initial reproduction number of A/Singapore/1/1957 or A/Berkeley/1/68 by 15%–20%. A basic reproduction number (R0) of the emerging transmissible virus <1.2 predicts a preventable pandemic.

Conclusions

Population immunity to H2 viruses is insufficient to block epidemic spread of H2 virus. An H2N2 pandemic would have lower impact in those born before 1968.


Url:
DOI: 10.1093/infdis/jiy291
PubMed: 29762672
PubMed Central: 6107991


Affiliations:


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PMC:6107991

Le document en format XML

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<div type="abstract" xml:lang="en">
<title>Abstract</title>
<sec id="s1">
<title>Background</title>
<p>Influenza A pandemics cause significant mortality and morbidity. H2N2 viruses have caused a prior pandemic, and are circulating in avian reservoirs. The age-related frequency of current population immunity to H2 viruses was evaluated.</p>
</sec>
<sec id="s2">
<title>Methods</title>
<p>Hemagglutinin inhibition (HAI) assays against historical human and recent avian influenza A(H2N2) viruses were performed across age groups in Rochester, New York, and Hong Kong, China. The impact of existing cross-reactive HAI immunity on the effective reproduction number was modeled.</p>
</sec>
<sec id="s3">
<title>Results</title>
<p>One hundred fifty individual sera from Rochester and 295 from Hong Kong were included. Eighty-five percent of patients born in Rochester and Hong Kong before 1968 had HAI titers ≥1:40 against A/Singapore/1/57, and >50% had titers ≥1:40 against A/Berkeley/1/68. The frequency of titers ≥1:40 to avian H2N2 A/mallard/England/727/06 and A/mallard/Netherlands/14/07 in subjects born before 1957 was 62% and 24%, respectively. There were no H2 HAI titers >1:40 in individuals born after 1968. These levels of seroprevalence reduce the initial reproduction number of A/Singapore/1/1957 or A/Berkeley/1/68 by 15%–20%. A basic reproduction number (R
<sub>0</sub>
) of the emerging transmissible virus <1.2 predicts a preventable pandemic.</p>
</sec>
<sec id="s4">
<title>Conclusions</title>
<p>Population immunity to H2 viruses is insufficient to block epidemic spread of H2 virus. An H2N2 pandemic would have lower impact in those born before 1968.</p>
</sec>
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