B.C. Centre for Disease Control warns of unusual late-season influenza wave

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      Flu season isn't over yet.

      According to the B.C. Centre for Disease Control, the province is in the midst of a second influenza A wave.

      It's "due to unusual late-season A(H3N2) predominance", states an influenza surveillance bulletin for the week of March 10 to 16.

      Over that week, 75 percent of the viruses in the subtyped influenza A category were in this category.

      The bulletin warns that it's too soon to know if this has peaked.

      "On March 21st, the WHO [World Health Organization] announced the recommended A(H3N2) component of the 2019–20 northern hemisphere influenza vaccine...a change from the current season's vaccine strain," the bulletin noted.

      The 2018–19 flu vaccine in B.C. protected against the following viruses: 

      •  A/Michigan/45/2015 (H1N1)pdm09-like virus
      •  A/Singapore/INFIMH-16-0019/2016 (H3N2)-like virus
      • B/Colorado/06/2017-like virus
      • B/Phuket/3073/2013-like virus (in quadrivalent vaccines only)