Genetic Analysis of a Swine H3N2 Influenza Virus Strain Isolated in Korea in 2017

摘要

Pigs are regarded as a "mixing vessel", in which novel influenza viruses may emerge. We isolated a novel swine H3N2 influenza virus from a pig that suffered from severe respiratory symptoms on a farm in South Korea in June, 2017. Genetic analysis showed that this virus was a reassortant strain, containing genes from swine H3N2 and H1N2 influenza viruses. Six genes (PB2, PB1, HA, NP, NA, NS) derived from swine H3N2 influenza viruses and two genes (PA and M) came from swine H1N2 influenza viruses. Our results suggest that reassortment indeed occurs in pigs, indicating that continuous monitoring of influenza virus isolates in pigs is needed for animal and human health because influenza viruses infect both humans and animals.