Yassine HM, Smatti MK. Will the influenza A(H3N8) cause a major public health threat?. Int J Infect Dis. 2022 Sep 5:S1201-9712(22)00499-4
The diversity of zoonotic influenza viruses and their ability to cross the species barrier have been always alarming and required a continuous surveillance in both human and animal populations. Avian A(H3N8) influenza viruses are frequently detected in animals and represent one of the most common subtypes in wild birds. Cross-species transmission of avian A(H3N8) influenza viruses have been reported for multiple mammalian hosts, including the outbreaks in horses and dogs by the equine and canine lineages of A(H3N8), respectively. In humans, there was no evidence of influenza A(H3N8) infection until 25 April 2022, when the Chinese health authority reported the first-ever human H3N8 case in a 4-year-old boy from Henan Province. Although there are no information that this virus has the ability to sustain human transmission, additional epidemiological and virological studies are needed to better assess the replication potency of the virus in human cells as well as the risk posed to public health. Here, we briefly discuss the influenza A(H3N8) virus interspecies spread, with the focus on transmission in humans.
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