Influenza is an acute viral respiratory infection causing fever and muscle pain. Four main types: A, B, C, and D viruses with different antigenic characteristics. Influenza A viruses cause epidemics, B viruses cause localized outbreaks
Flu is a viral respiratory illness causing fever, chills, and cough. Spreads easily through airborne droplets and contaminated surfaces. Most people recover fully, but high-risk groups face severe complications
H3N2 is a subtype of influenza A virus. All IAV subtypes share negative-sense segmented RNA genome. Virus can evolve through genetic reassortment between different strains
Influenza B virus is the only species in Betainfluenzavirus genus. Infects humans, ferrets, pigs, and seals. Mutates 2-3 times slower than influenza A virus. Has 500 surface projections made of hemagglutinin and neuraminidase
Stay home and rest to support immune system recovery. Avoid contact with others during contagious period. Stay home for 1 day after fever subsides. Wear face mask when going out
Flu A accounts for 75% of total influenza cases, while flu B is less common. Only flu A can cause pandemics, while both cause epidemics. Flu A is more severe in adults, while flu B affects children more. Flu A appears earlier in season, while flu B occurs later. Flu A can spread from animals to humans, while flu B only affects humans