LID scientists are collaborating with scientists from MedImmune under a CRADA to generate candidate vaccines against avian influenza viruses of each subtype, including H5N1 viruses that have caused human infections since 2003. The vaccines were generated using plasmid based reverse genetics and each contains the hemagglutinin and neuraminidase genes from an avian influenza virus and six internal gene segments from the AA ca virus. Highly pathogenic avian influenza is a disease of poultry that is caused by H5 or H7 avian influenza viruses and is associated with up to 100% mortality. HPAI viruses of the H5 and H7 subtypes typically possess multiple basic amino acids around the cleavage site (MBS) of their hemagglutinin (HA) protein, a recognized virulence motif in poultry. To determine the importance of the H5 HA MBS as a virulence factor in mammals, recombinant wild-type HPAI A/Vietnam/1203/2004 (H5N1) viruses that possessed (H5N1) or lacked (ΔH5N1) the H5 HA MBS were generated and evaluated for their virulence in BALB/c mice, ferrets, and African green monkeys (Chlorocebus aethiops). The presence of the H5 HA MBS was associated with lethality, significantly higher virus titers in the respiratory tract, virus dissemination to extrapulmonary organs, lymphopenia, significantly elevated levels of pro-inflammatory cytokines and chemokines and inflammation in the lungs of mice and ferrets. In African green monkeys, neither H5N1 nor ΔH5N1 virus was lethal and neither caused clinical symptoms. The H5 HA MBS was associated with mild enhancement of replication and delayed virus clearance. Thus, the contribution of H5 HA MBS to the virulence of the HPAI H5N1 virus varies among mammalian hosts and is most significant in mice and ferrets and less remarkable in nonhuman primates.

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Baz, Mariana; Boonnak, Kobporn; Paskel, Myeisha et al. (2015) Nonreplicating influenza A virus vaccines confer broad protection against lethal challenge. MBio 6:e01487-15
Baz, Mariana; Paskel, Myeisha; Matsuoka, Yumiko et al. (2015) A Single Dose of an Avian H3N8 Influenza Virus Vaccine Is Highly Immunogenic and Efficacious against a Recently Emerged Seal Influenza Virus in Mice and Ferrets. J Virol 89:6907-17
Baz, Mariana; Paskel, Myeisha; Matsuoka, Yumiko et al. (2015) A live attenuated equine H3N8 influenza vaccine is highly immunogenic and efficacious in mice and ferrets. J Virol 89:1652-9
Czako, Rita; Subbarao, Kanta (2015) Refining the approach to vaccines against influenza A viruses with pandemic potential. Future Virol 10:1033-1047
Xiong, Xiaoli; Corti, Davide; Liu, Junfeng et al. (2015) Structures of complexes formed by H5 influenza hemagglutinin with a potent broadly neutralizing human monoclonal antibody. Proc Natl Acad Sci U S A 112:9430-5
Moore, Ian N; Lamirande, Elaine W; Paskel, Myeisha et al. (2014) Severity of clinical disease and pathology in ferrets experimentally infected with influenza viruses is influenced by inoculum volume. J Virol 88:13879-91
Broadbent, Andrew J; Santos, Celia P; Godbout, Rachel A et al. (2014) The temperature-sensitive and attenuation phenotypes conferred by mutations in the influenza virus PB2, PB1, and NP genes are influenced by the species of origin of the PB2 gene in reassortant viruses derived from influenza A/California/07/2009 and A/WSN/ J Virol 88:12339-47
Boonnak, Kobporn; Vogel, Leatrice; Feldmann, Friederike et al. (2014) Lymphopenia associated with highly virulent H5N1 virus infection due to plasmacytoid dendritic cell-mediated apoptosis of T cells. J Immunol 192:5906-12
Chen, Zhongying; Baz, Mariana; Lu, Janine et al. (2014) Development of a high-yield live attenuated H7N9 influenza virus vaccine that provides protection against homologous and heterologous H7 wild-type viruses in ferrets. J Virol 88:7016-23
O'Donnell, Christopher D; Vogel, Leatrice; Matsuoka, Yumiko et al. (2014) The matrix gene segment destabilizes the acid and thermal stability of the hemagglutinin of pandemic live attenuated influenza virus vaccines. J Virol 88:12374-84

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