Daniela Hernandez | WSJ – Getting the flu can increase the risk of getting a second infection, including strep throat. WSJ’S Daniela Hernandez explains the science behind that, plus what it means for the rest of the winter and how we can protect ourselves so the tripledemic doesn’t get worse.

Video timeline: 0:24 – Flu Damage 1:25 – Lower population immunity 2:03 – Who’s most vulnerable? 3:05 – How can we protect ourselves?