BA.4 and BA.5 Are New Omicron Subvariants: What to Know | Time

BA.4 and BA.5 Are New Omicron Subvariants: What to Know | Time: One thing is clear, though: a lot of Americans are susceptible to reinfection from these subvariants. “We can expect to be reinfected,” Luo says. “And every time we’re infected, it’s at best a hassle. And at worst, it can lead to debilitating symptoms,” she adds, pointing to the risk of Long COVID—which, recent studies suggest, is common even among people who have been vaccinated.