A complicated fall vaccine campaign: Updated Covid boosters, flu shots, and how to time the jabs

For the health officials who steer vaccination campaigns, it’s going to be a complicated fall. The U.S. plan to roll out updated Covid-19 boosters will not only coincide with the logistical tangle of the regular flu shot drive, but will also face questions about when people should get the new shots to provide themselves with the best protection through our third Covid winter. It’s a balancing act that health officials run into every year with flu. Vaccinating tens of millions of people takes weeks. People also need a few weeks after their shot for their immune systems to be fully primed. And yet, vaccinators don’t want to put shots in arms too early, either.