Coronavirus: Covid vaccine makers may need to infect subjects to get results

If the disease ebbs further in some regions, not enough people will be exposed to the coronavirus to make studies possible. Researchers may have to consider deliberately infecting healthy volunteers with the virus, though it's still too early to take that step, he said.

source https://timesofindia.indiatimes.com/world/us/coronavirus-covid-vaccine-makers-may-need-to-infect-subjects-to-get-results/articleshow/76105272.cms