Researchers from the School of Veterinary Medicine of South China Agricultural University published the latest research in the Journal of Clinical Microbiology. They tested the pigs in southern China for the first time and found that the three virus strains had positive blood tests, but did not include the H5N1 avian influenza. virus. This study sounded the alarm for public health agencies, stating that surveillance should be strengthened in the pork industry to prevent avian influenza viruses from infecting humans through pork.
Influenza A viruses cause influenza outbreaks every year and have caused serious epidemics that have killed millions of people. Both human influenza virus and avian influenza virus can infect pigs, which also makes pigs a "mixed container" for influenza virus gene recombination. In laboratory studies, avian influenza virus H1-H13 subtypes can infect pigs, but in nature, pigs infected with avian influenza virus have been rarely reported.
Professor Zhang Guihong and his colleagues of the School of Veterinary Medicine of South China Agricultural University conducted a two-year study to examine 1080 pigs aged 21 to 25 weeks of age for influenza viruses, including avian influenza viruses H3, H4, H5, H6 subtypes and pigs Influenza virus H1, H3 subtypes. The study results showed that 35% of the serum samples were positive for H1N1, 19.7% were positive for H3N2 swine influenza virus, 0.93% were positive for avian influenza virus H3 subtype, 1.6% were positive for avian influenza virus H4 subtype, and 1.8% were avian influenza Virus H6 subtype is positive. However, the serum samples collected in 2001 did not detect the above virus positive, indicating that these viruses infected pigs recently.
In 2009, new recombinant H2N3 influenza viruses were isolated from pigs in the United States. These viruses are very similar to the H2N2 virus in the 1957 influenza epidemic, and they are highly infectious in pigs and ferrets.
In view of the fact that pigs have been infected with avian influenza virus recently, "we strongly recommend that the pork industry in various regions strengthen the monitoring of the epidemic of this virus to prevent the infection of avian influenza virus through pork to people," said Professor Zhang Guihong.
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