Now, BA.4 and BA.5 are here, and they're starting to make up a larger proportion of U.S. cases. So if someone was recently infected with a BA.2 lineage, are they mostly protected against reinfection with BA.4 or BA.5? It's unlikely that someone who was recently infected by a BA.2 lineage will be reinfected with that lineage, Lawler said. "BA.2 is as different from BA.1 as delta was from Alpha ... in terms of the number and types of mutations," Lawler said. I just recovered from BA.2.

Source: ABC News June 21, 2022 19:19 UTC