Influenza Immunization and Prophylaxis is a topic covered in the Johns Hopkins Antibiotic (ABX) Guide.

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PATHOGENS

  • Influenza seasonal:
    • Influenza A: predominantly H1N1, H3N2
    • Influenza B
  • Pandemic H1N1 (2009)
  • H3N2v: Swine influenza strain with triple re-assortment, emerging 2011-2013 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 [6]. In June 2013, 4 cases reported in Indiana. Currently available vaccines do not cover H3N2v.

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Last updated: August 19, 2015