Question: does the 2020 flu shot protect against influenza a?
Answer: 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)