section_heading: Azijska gripa
paragraph_text: Pandemični sojevi H2N2 i H3N2 sadržavali su RNK segmente virusa ptičje gripe.<ref>Chapter Two : Avian Influenza by Timm C. Harder and Ortrud Werner from free on-line Book called Influenza Report 2006 which is a medical textbook that provides a comprehensive overview of epidemic and pandemic influenza.