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pubmed: H5N1 epidemiology

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Cross-reactive antibodies against H7N9 and H5N1 avian influenza viruses in Thai population.
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Cross-reactive antibodies against H7N9 and H5N1 avian influenza viruses in Thai population.

Asian Pac J Allergy Immunol. 2017 Mar;35(1):20-26

Authors: Jiang L, Changsom D, Lerdsamran H, Masamae W, Jongkaewwattana A, Iamsirithaworn S, Oota S, Louisirirotchanakul S, Auewarakul P, Puthavathana P

BACKGROUD: Avian influenza H5N1 and H7N9 viruses have jumped across species from avian to humans and become a threat to public health. Not much is known about pre-existing cross-reactive antibodies against these avian viruses in human population.
OBJECTIVE: To determine the prevalence of cross-reactive anti-HA and anti-NA antibodies to avian influenza H5N1 and H7N9 viruses in Thai population.
METHOD: Archival serum samples from 100 blood donors and 21 patients infected with 2009 pandemic influenza A (H1N1) (pdmH1N1) virus were investigated by hemagglutination-inhibition (HAI) and neuraminidase-inhibition (NAI) assays for anti-HA and anti-NA antibodies, respectively. The test antigens comprised 2 human viruses (pdmH1N1 and H3N2 viruses), and 6 reassortant viruses carrying HA and NA genes of avian H5N1 or H7N9 virus generated by reverse genetics.
RESULTS: HAI antibody titers ≥ 10 were found in 58, 89, 0 and 15% of blood donors as tested against pdmH1N1, H3N2, H5N1 and H7N9 viruses, respectively. On the other hand, NAI antibodies were detected in 98, 94, 73 and 53% of blood donors when reverse genetic-derived viruses harboring NA gene from pdmH1N1, H3N2, H5N1 or H7N9 virus were used as the test antigens. Moreover, 66.7% of pdmH1N1 patients who had > 4 fold increase in HAI antibody titers in paired sera developed > 4 fold increase in NAI antibody titers.
CONCLUSIONS: Anti-NA antibody has broader reactivity than anti-HA antibody, therefore, it can be a supplement to anti-HA antibody in the prevention against novel influenza viruses.

PMID: 27543728 [PubMed - indexed for MEDLINE]