Testing for antibodies to Covid-19 do hold promise but they're still a long way from delivering on those promises, experts say. Here's how antibody tests work and where we stand now with Covid-19 antibody tests.

There's no way to reverse or cure a food allergy yet, but scientists are working on it. In the meantime, here are the existing, new, and coming treatments, including oral immunotherapy, that may help curb allergic reactions.