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

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  • Influenza A (seasonal): in 2017-2018, judged a highly severe season, H3N2 (influenza A) was the predominant isolate. Nationally, influenza A was 71.2%, influenza B 28.8%. Subtyping of isolates identified influenza A(H3N2) 84.9%, influenza A(H1N1)pdm09 15.1%.
  • Influenza A: recently active strains
    • H3N2: seasonal influenza, predominant strain in 2017-2018 in U.S.
    • H1N1v: detected Jan 2015 with handful of reported infections in U.S.
    • Other novel strains (usually limited): A(H1N2) variant (H1N2v) virus (2016), A(H7N2) (2016)
    • H3N2v: Swine influenza strain with triple re-assortment, emerging 2011-2013 in multiple states in the U.S., continues to circulate including in 2017.
      • 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, continues to be identified in seasonal influenza.
    • Other: multiple avian influenza or other strains
  • Influenza B (seasonal)

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Last updated: January 16, 2019


Auwaerter, Paul G. "Influenza." Johns Hopkins ABX Guide, The Johns Hopkins University, 2019. Pediatrics Central, peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540285/all/Influenza.
Auwaerter PG. Influenza. Johns Hopkins ABX Guide. The Johns Hopkins University; 2019. https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540285/all/Influenza. Accessed April 19, 2019.
Auwaerter, P. G. (2019). Influenza. In Johns Hopkins ABX Guide. Available from https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540285/all/Influenza
Auwaerter PG. Influenza [Internet]. In: Johns Hopkins ABX Guide. The Johns Hopkins University; 2019. [cited 2019 April 19]. Available from: https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540285/all/Influenza.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC T1 - Influenza ID - 540285 A1 - Auwaerter,Paul,M.D. Y1 - 2019/01/16/ BT - Johns Hopkins ABX Guide UR - https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540285/all/Influenza PB - The Johns Hopkins University DB - Pediatrics Central DP - Unbound Medicine ER -