Duan Y, Gu H, Chen R, Zhao Z, Zhang L, et al. Response of Mice and Ferrets to a Monovalent Influenza A (H7N9) Split Vaccine. PLoS ONE 9(6): e99322. doi:10.1371/journal.pone.0099322
In early spring 2013, the emergence of the influenza A (H7N9) virus in humans in Eastern China raised concerns of a new influenza pandemic. Development of a safe and effective H7N9 influenza vaccine is urgently needed. To this end, we first synthesized the hemagglutinin (HA) and neuraminidase (NA) genes of the influenza A (H7N9) virus A/AnHui/1/2013. Using reverse genetics, we rescued a reassortant virus (H7N9/PR8) that contained the HA and NA genes from wild-type H7N9 and six genes encoding internal proteins from the A/Puerto Rico/8/34 (PR8) virus. Next, the pathogenicity of the reassortant virus was evaluated both in vivo and in vitro. We found that the virus was non-pathogenic in mice and was stable after serial passaging in eggs. Furthermore, we found that a monovalent influenza A (H7N9) split vaccine prepared from the virus was immunogenic in mice and ferrets. When given intramuscularly, the vaccine (two doses of at least 15-μg) completely protected mice from normally lethal wild-type H7N9 virus challenge. In summary, our H7N9 vaccine, developed over a short time, is a potential candidate for further clinical evaluation and human use.
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