![]() ![]() Early evidence points toward vaccines reducing transmission of Covid-19, but by exactly how much remains unclear.Ī recent pre-print paper (not yet peer-reviewed) found that the Pfizer-BioNTech Covid-19 vaccine reduces viral loads, a key marker that shapes how readily the virus can spread, four-fold between 12 and 28 days after the first dose. ![]() Transmission also has important practical consequences for the risks that arise as vaccinated individuals interact with everyone else, whether that’s in public parks, schools, households, or health care facilities. ![]() Rich countries are hoarding Covid-19 vaccines That threshold is herd immunity - where even people who haven’t been vaccinated or infected before are protected because so many of the people around them are immune. Vaccines serve not only to protect individuals but also, after a certain threshold of vaccination, the population as a whole. Key among them is how well vaccines work to block transmission of SARS-CoV-2, the virus that causes Covid-19. Though clinical trials give us confidence that the Pfizer/BioNTech and Moderna vaccines block close to 95 percent of cases of the disease - thereby preventing the most severe outcomes of Covid-19 - there are still some uncertainties. “We have every reason to believe that these are among some of the very best vaccines that we have ever tested,” said Aaron Richterman, a fellow researching infectious diseases at the University of Pennsylvania. But, clearly, the rapid rollout of Covid-19 vaccines, like the ones developed by Moderna and Pfizer/BioNTech, is our best path out of the crisis. Surely, this means we can stop wearing a face mask?Īs with so much else in this pandemic, there isn’t an easy answer for exactly when we can start to relax. You can read the study here: Effect of Vaccination on Household Transmission of SARS-CoV-2 Delta VOC.After months of exhausting isolation, widespread economic pain, and an extraordinary toll on human life and health, several Covid-19 vaccines are here. ![]() The research, which has been published as a pre-print, is based on data from Danish households where at least one person has been infected with the Delta variant. About the studyĪ new study by scientists at the University of Copenhagen and Statens Serum Institut (SSI) examines how well the vaccines protect against becoming infected and against transmitting the SARS-CoV-2 virus if you have become infected. It is important that we now have knowledge that supports the fact that the vaccines not only protect you against becoming ill but also lower the risk of transmitting the virus considerably,” says doctor Camilla Holten Møller from SSI. “The viral load is generally lower in vaccinated persons with an infection than in unvaccinated persons, which is likely a reason for why vaccinated persons to a lesser degree transmit the virus to other household members. The results show that vaccinated persons, who are infected with SARS-CoV-2, generally have a lower viral load than unvaccinated persons. The study further examines the difference in the viral load amongst unvaccinated and vaccinated persons infected with the Delta variant. Vaccinated persons have a lower viral load than unvaccinated persons The research does not include people who had been re-vaccinated. The vaccine effectiveness against transmission was 42% compared to unvaccinated persons, the study found. The research also shows that vaccinated persons who were infected had a lower risk of transmitting the virus to other household members than unvaccinated persons. The overall vaccine effectiveness against infection was 61% compared to unvaccinated persons. The scientists found that vaccinated persons in the household had a lower risk of getting infected than unvaccinated persons. The study includes 24.693 households with additionally 53.584 household members in the period June to October 2021, where the Delta variant was the dominant variant and where the epidemic was on a lower level. The study examines how many persons in a household become infected if a member of the household has been infected with the coronavirus. A new study of infections with the Delta variant in Danish households shows that vaccines both protect against infection and against transmitting the virus to other persons. ![]()
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