People who are vaccinated against Covid-19 are less likely to spread the virus even if they become infected, a new study finds.
, backing up prior studies. Even so, people who were fully vaccinated were still less likely to infect others.
There is emerging evidence that even though cycle threshold values may be the same regardless of vaccination status, people who are vaccinated may have less infectious virus in their bodies, potentially reducing transmission. Richterman pointed to a recentfrom China that found a large reduction in transmission in those who had received two doses of vaccine, compared to the unvaccinated.
“People who have been vaccinated will have immune systems at the ready that can coat the virus in antibodies much more quickly than unvaccinated people who have to build up an immune response,” Richterman said.The new study showed that protection against transmission seemed to wane over time, however. After three months, people who had breakthrough infections after being vaccinated with AstraZeneca were just as likely to spread the delta variant as the unvaccinated.
“We know that the amount of antibodies circulating in the blood decreases over time after vaccination, even though the immune memory remains durably robust and is still able to prevent infections, particularly severe infection,” he said. “These circulating antibodies that are immediately available probably play some role in preventing transmission if infected, so I don’t think it’s surprising to see some reduced protection against transmission over time.
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