METHODS: A field investigation was conducted after a case identified with infection of European avian-like swine influenza H1N1 virus. The diagnosis was confirmed by real-time PCR, virus isolation, whole genome sequencing and serological assays. Samples from local pigs and close contacts were tested to identify the source of infection and route of transmission.
RESULTS: The virus from the index case was similar to viruses circulating in the local pigs. The case\'s grandfather was asymptomatic with sero-conversion. A total of 42.8% of swine sera were positive for European avian-like swine H1N1.
CONCLUSIONS: This study highlighted the importance of performing surveillance on swine influenza to monitor new virus emergence in humans.