Influenza Immunization and Prophylaxis

PATHOGENS

• Influenza seasonal: H1N1, H3N2 and B.
• Pandemic H1N1 (2009)
• H3N2v: Swine influenza strain with triple reassortment, emerging 2011-2012 in US. Strain noted previously in humans, but those cases related to swine exposure. No clear human-human sustained transmission documented to date, cases observed in 5 states and susceptible to neuraminidases. Children < 10 yrs may be most prone as older children and adults may have some immunity by exposure to earlier influenza strains. No clear indication of increased severity of disease^[1].