Influenza is a topic covered in the Johns Hopkins ABX Guide.

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PATHOGENS

  • Influenza A (seasonal): in 2015-2016 season, of analyzed specimens influenza A comprised 70.8% and 29.2% were influenza B viruses. Of influenza A, 80.7% were influenza A(H1N1)pdm09 viruses, and 19.3% were influenza A(H3N2) viruses. Lineage was determined for 4,912 (63.3%) influenza B viruses; 3,367 (68.5%) were B/Yamagata lineage, and 1,545 (31.5%) were B/Victoria lineage.
  • Influenza A: recently active strains
    • H3N2: seasonal influenza
    • H1N1v: detected Jan 2015 with handful of reported infections in U.S.
    • H3N2v: Swine influenza strain with triple re-assortment, emerging 2011-2013 multiple states in the U.S. continue to circulate
      • Most human cases have had pig contact.
      • Strain has been susceptible to neuraminidases.
      • People at high risk for severe consequences with influenza should avoid pig contact.
      • 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.
    • Pandemic H1N1, remains active since pandemic 2009 in seasonal influenza
    • Other: multiple avian or other strains
  • Influenza B (seasonal)

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Last updated: October 5, 2016