translation.da: A, B og C. Den farligste for mennesker er type A. Det naturlige reservoir for influenzavirus er den forskelligartede og konstant vekslende pool af virus blandt vilde fugle, fugleinfluenzavirus.
translation.en: A, B and C. The most significant threat to humans arises from the influenza A viruses. The natural reservoir of influenza viruses is a diverse and constantly changing pool of viruses among wild water bird populations, the avian influenza (AI) viruses.