Some Volunteers Want To Be Infected With Coronavirus To Help Find A Vaccine. But It Isn’t That Simple.

The most compelling argument against human challenge trials for a COVID-19 vaccine, though, is that it might not actually be any faster. In order to infect people with the virus, we have to have a tested viral dose — one that is strong enough to infect people, but not so strong it gives an infection worse than natural spread — which can take up to a year to develop, according to Weijer.