Cases of Interspecies Transmission of Influenza A Virus from Swine to Humans
Klivleyeva N. Glebova T. Saktaganov N. Webby R.
September 2025Multidisciplinary Digital Publishing Institute (MDPI)
Veterinary Sciences
2025#12Issue 9
Influenza A viruses infect many animal species and have great zoonotic potential. The epidemiology of swine influenza worldwide is of particular importance because the pig can act as a “mixing vessel” where avian and human influenza viruses can undergo genetic reassortment, creating new viruses. Zoonotic transmission allows new strains of influenza A viruses to be introduced into the human population, potentially causing the next influenza pandemic. The dynamic nature of swine influenza viruses poses challenges to both the swine industry and public health as a source of zoonotic infection. Human infections with swine influenza viruses are regularly reported. Many of these zoonotic events have occurred through close contact between humans and pigs, particularly at agricultural fairs, which have become a source of emerging of swine-origin influenza A viruses. These unique pig–human interfaces have caused the majority of human infections with variant influenza A viruses. In this review, we examine zoonotic spread of influenza A viruses of swine origin, transmission of influenza viruses from pigs to humans worldwide, and the reasons for the emergence of zoonoses.
epizootology , influenza viruses , reassortment , swine influenza , transmission , zoonotic infection
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The Research and Production Center for Microbiology and Virology, Almaty, 050010, Kazakhstan
Department of Infectious Disease, St. Jude Children’s Research Hospital, Memphis, 38105-3678, TN, United States
The Research and Production Center for Microbiology and Virology
Department of Infectious Disease
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