They looked at infections in people who have been vaccinated or previously infected compared with unvaccinated and previously uninfected individuals. In this unpublished preprint, researchers report on the infectiousness of SARS-CoV-2 infections in a US state prison system during the Omicron wave. What did the researchers do?Ĭontagious diseases such as COVID-19 spread easily in prison settings, often because of overcrowding and prisoners sharing cells with inadequate ventilation and sanitation.
We know that vaccination continues to be effective at preventing severe disease and death and protecting against Long Covid, but researchers decided to look at how well vaccination and booster doses stop the transmission of infection in people who have breakthrough infections.
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The data shows that although vaccination may not entirely eliminate the risk of a vaccinated person with a breakthrough infection from spreading the virus to others, it can greatly reduce the risk. Vaccination helped reduce transmission, however since the surge of the Omicron variant, breakthrough infections among vaccinated individuals and reinfections among previously infected individuals are more common. Before widespread vaccination, most people were susceptible, especially those with underlying conditions, or those with weaker immune systems. The transmission dynamics of SARS-CoV-2 have shifted since the start of the pandemic.
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