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
Health 6 September 2025
By Clare Wilson
Booster vaccines may help prevent the spread of the coronavirus
Dinendra Haria/SOPA Images/LightRocket via Getty Images
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 …
