does the 2020 flu shot protect against influenza a?
Flu vaccines protect against the three or four viruses (depending on the vaccine) that research suggests will be most common. For 2019-2020, trivalent (three-component) vaccines are recommended to contain: A/Brisbane/02/2018 (H1N1)pdm09-like virus (updated) A/Kansas/14/2017 (H3N2)-like virus (updated)