MMWR: Summer Flu Activity in the U.S. and Composition of the 2020 Southern Hemisphere Flu Vaccine
Summer flu activity was low in the U.S. with cocirculation of influenza A and B viruses. In the Southern Hemisphere, flu viruses circulated widely, with influenza A(H3) predominating in many regions; however, influenza A(H1N1)pdm09 and B viruses were pre-dominant in some countries. It's too early to know which viruses will predominate in the U.S. this season. Now is a good time to get a flu vaccine.