CDC - Types of Influenza Viruses | Seasonal Influenza (Flu)
經安全檢測,此網站為安全網站,請放心前往原始網址!
CDC - Types of Influenza Viruses | Seasonal Influenza (Flu)
There are three types of influenza viruses: A, B and C. Human influenza A and B
... In the spring of 2009, a new influenza A (H1N1) virus (CDC 2009 H1N1 Flu ...