Serveur d'exploration H2N2

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Evaluation of Multivalent H2 Influenza Pandemic Vaccines in Mice

Identifieur interne : 000318 ( Main/Exploration ); précédent : 000317; suivant : 000319

Evaluation of Multivalent H2 Influenza Pandemic Vaccines in Mice

Auteurs : Brian J. Lenny [États-Unis] ; Stephanie Sonnberg [États-Unis] ; Angela F. Danner [États-Unis] ; Kimberly Friedman [États-Unis] ; Richard J. Webby [États-Unis] ; Robert G. Webster [États-Unis] ; Jeremy C. Jones [États-Unis]

Source :

RBID : PMC:5336516

Descripteurs français

English descriptors

Abstract

Subtype H2 Influenza A viruses were the cause of a severe pandemic in the winter of 1957. However, this subtype no longer circulates in humans and is no longer included in seasonal vaccines. As a result, individuals under 50 years of age are immunologically naïve. H2 viruses persist in aquatic birds, which were a contributing source for the 1957 pandemic, and have also been isolated from swine. Reintroduction of the H2 via zoonotic transmission has been identified as a pandemic risk, so pre-pandemic planning should include preparation and testing of vaccine candidates against this subtype. We evaluated the immunogenicity of two inactivated, whole virus influenza vaccines (IVV) in mice: a monovalent IVV containing human pandemic virus A/Singapore/1/1957 (H2N2), and a multivalent IVV containing human A/Singapore/1/1957, avian A/Duck/HongKong/319/1978 (H2N2), and swine A/Swine/Missouri/2124514/2006 (H2N3) viruses. While both vaccines induced protective immunity compared to naïve animals, the multivalent formulation was advantageous over the monovalent in terms of level and breadth of serological responses, neutralization of infectious virus, and reduction of clinical disease and respiratory tissue replication in mice. Therefore, multivalent pandemic H2 vaccines containing diverse viruses from animal reservoirs, are a potential option to improve the immune responses in a pre-pandemic scenario where antigenic identity cannot be predicted.


Url:
DOI: 10.1016/j.vaccine.2017.01.026
PubMed: 28189402
PubMed Central: 5336516


Affiliations:


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<term>Humains</term>
<term>Immunité humorale</term>
<term>Modèles animaux de maladie humaine</term>
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<div type="abstract" xml:lang="en">
<p id="P2">Subtype H2 Influenza A viruses were the cause of a severe pandemic in the winter of 1957. However, this subtype no longer circulates in humans and is no longer included in seasonal vaccines. As a result, individuals under 50 years of age are immunologically naïve. H2 viruses persist in aquatic birds, which were a contributing source for the 1957 pandemic, and have also been isolated from swine. Reintroduction of the H2 via zoonotic transmission has been identified as a pandemic risk, so pre-pandemic planning should include preparation and testing of vaccine candidates against this subtype. We evaluated the immunogenicity of two inactivated, whole virus influenza vaccines (IVV) in mice: a monovalent IVV containing human pandemic virus A/Singapore/1/1957 (H2N2), and a multivalent IVV containing human A/Singapore/1/1957, avian A/Duck/HongKong/319/1978 (H2N2), and swine A/Swine/Missouri/2124514/2006 (H2N3) viruses. While both vaccines induced protective immunity compared to naïve animals, the
<bold>multivalent</bold>
formulation was advantageous over the monovalent in terms of level and breadth of serological responses,
<bold>neutralization of infectious virus</bold>
, and reduction of clinical disease and respiratory tissue replication in mice. Therefore,
<bold>multivalent</bold>
pandemic H2 vaccines containing diverse viruses from animal reservoirs, are a potential option to improve the immune responses in a pre-pandemic scenario where antigenic identity cannot be predicted.</p>
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