Companies to now test drugs that deliver antibodies to fight Covid-19

The experimental drugs shortcut the process of antibody formation by giving concentrated versions of specific ones that worked best against the coronavirus in tests

Companies are rushing to test what may be the next best thing: drugs that deliver antibodies to fight the virus right away, without having to train the immune system to make them.

Antibodies are proteins the body makes when an infection occurs; they attach to a virus and help it be eliminated. Vaccines work by tricking the body into thinking there's an infection so it makes antibodies and remembers how to do that if the real bug turns up.

But it can take a month or two after vaccination or infection for the most effective antibodies to form. The experimental drugs shortcut