My 6-year-old has been exposed to SARS-CoV-2 at least four times and never tested positive. Many people fall into that category. Researchers have theories about why they've been able to ward it off.
An analysis of blood from people who had received the Johnson & Johnson COVID-19 vaccine found a lower level of neutralizing antibodies against viral variants but a strong response involving T cells.
What if your body could corral an infection instead of eliminating it? Immunologists who see this sort of "disease tolerance" in plants wonder what role it might play in asymptomatic human infections.
Two new human studies back earlier hints that vaccines designed to prevent respiratory infections might also provide some protection against Alzheimer's disease.
A growing number of researchers think until there's an effective vaccine, the coronavirus will simply persist in the population, causing illness indefinitely. Better to squelch the spread instead.
