Vaccinations and past infections reduce risk of spreading covid-19

Inmates in Californian prisons who got covid-19 during the omicron wave were less likely to pass it onto their cellmates if they had been vaccinated or had been infected before

By Clare Wilson

People who have been vaccinated against covid-19 and also had a previous infection have a 41 per cent lower risk of passing on the coronavirus if they become infected again, compared with someone who is unvaccinated and has had no past infections.

The finding comes from a study carried out in US prisons that looked at how often people passed on the virus to someone sharing their cell. It was done during the omicron wave.

The research rebuts the idea that the …