‘Super-Immune’ People May Hold Key to Better Vaccines

More than half of Americans may have never had Covid, according to U.S. government data, leaving scientists wondering whether those who’ve avoided the novel coronavirus might actually be immune to the virus altogether. This could offer new clues into how to attack Covid.

At this stage in the pandemic, people may be immune due to vaccines, a past infection, or a combination of both. There’s also evidence that, in rare instances, some people may be Covid-immune without infection or vaccination at all.

The coronavirus’s frequent mutations and the fact that immunity wanes over time make it difficult to discern how many ...