{"id":30603,"date":"2021-03-11T18:51:10","date_gmt":"2021-03-11T14:51:10","guid":{"rendered":"http:\/\/www.mauritiustimes.com\/mt\/?p=30603"},"modified":"2021-03-11T18:51:10","modified_gmt":"2021-03-11T14:51:10","slug":"can-vaccinated-people-still-spread-the-coronavirus","status":"publish","type":"post","link":"https:\/\/www.mauritiustimes.com\/mt\/can-vaccinated-people-still-spread-the-coronavirus\/","title":{"rendered":"Can vaccinated people still spread the coronavirus?"},"content":{"rendered":"

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You’ve been vaccinated; can you now safely see your friends and family? New research hints that vaccinated people may be less likely to transmit the coronavirus, but they are not 100% in the clear<\/em><\/span><\/h4>\n

\"\"<\/span><\/em>Vaccinated people are wondering whether they can ease social distancing and mask-wearing.\u00a0AP Photo\/Darko Bandic<\/a><\/span><\/span><\/p>\n

Editor\u2019s note: So you\u2019ve gotten your coronavirus vaccine, waited the two weeks for your immune system to respond to the shot and are now fully vaccinated. Does this mean you can make your way through the world like the old days without fear of spreading the virus? Deborah Fuller is a microbiologist at the University of Washington School of Medicine working on coronavirus vaccines. She explains what the science shows about transmission post-vaccination \u2013 and whether new variants could change this equation.<\/span><\/em><\/p>\n

1. Does vaccination completely prevent infection?<\/strong><\/span><\/p>\n

The short answer is no. You can still get infected after you\u2019ve been vaccinated. But your chances of getting seriously ill are almost zero.<\/span><\/p>\n

Many people think vaccines work like a shield, blocking a virus from infecting cells altogether. But in most cases, a person who gets vaccinated is protected from disease, not necessarily infection.<\/span><\/p>\n

Every person\u2019s immune system is a little different, so when a vaccine is 95% effective, that just means 95% of people who receive the vaccine \u2013 but who would have gotten ill if exposed to the virus before \u2013 won\u2019t get sick. These people could be completely protected from infection, or they could be getting infected but remain asymptomatic because their immune system eliminates the virus very quickly. The remaining 5% of vaccinated people \u2013 if exposed to the virus \u2013 could become infected and get sick, but are extremely unlikely to be hospitalized.<\/span><\/p>\n

Vaccination doesn\u2019t 100% prevent you from getting infected, but in all cases it gives your immune system a huge leg up on the coronavirus. Whatever your outcome \u2013 whether complete protection from infection or some level of disease \u2013 you will be better off after encountering the virus than if you hadn\u2019t been vaccinated.<\/span><\/p>\n

2. Does infection always mean transmission?<\/span><\/strong><\/p>\n

Transmission happens when enough viral particles from an infected person get into the body of an uninfected person. In theory, anyone infected with the coronavirus could potentially transmit it. But a vaccine will reduce the chance of this happening.<\/span><\/p>\n

In general, if vaccination doesn\u2019t completely prevent infection, it will significantly reduce the amount of virus coming out of your nose and mouth \u2013 a process called shedding \u2013 and shorten the time that you shed the virus. This is a big deal. A person who sheds less virus is less likely to transmit it to someone else.<\/span><\/p>\n

This seems to be the case with coronavirus vaccines. In a recent preprint study which has yet to be peer reviewed, Israeli researchers tested 2,897 vaccinated people for signs of coronavirus infection. Most had no detectable virus, but people who were infected had one-quarter the amount of virus in their bodies as unvaccinated people tested at similar times post-infection.<\/span><\/p>\n

Less coronavirus virus means less chance of spreading it, and if the amount of virus in your body is low enough, the probability of transmitting it may reach almost zero. However, researchers don\u2019t yet know where that cutoff is for the coronavirus, and since the vaccines don\u2019t provide 100% protection from infection, the Centers for Disease Control and Prevention recommends that people continue to wear masks and social distance even after they\u2019ve been vaccinated.<\/span><\/p>\n

3. What about the new coronavirus variants?<\/span><\/strong><\/p>\n

New variants of coronavirus have emerged in recent months, and recent studies show that vaccines are less effective against certain ones, like the B1351 variant first identified in South Africa.<\/span><\/p>\n

Every time SARS-CoV-2 replicates, it gets new mutations. In recent months, researchers have found new variants that are more infective \u2013 meaning a person needs to breathe in less virus to become infected \u2013 and other variants that are more transmissible – meaning they increase the amount of virus a person sheds. And researchers have also found at least one new variant that seems to be better at evading the immune system, according to early data.<\/span><\/p>\n

So how does this relate to vaccines and transmission?<\/span><\/p>\n

For the South Africa variant, vaccines still provide greater than 85% protection from getting severely ill with COVID\u201319. But when you count mild and moderate cases, they provide, at best, only about 50%-60% protection. That means at least 40% of vaccinated people will still have a strong enough infection \u2013 and enough virus in their body \u2013 to cause at least moderate disease.<\/span><\/p>\n

If vaccinated people have more virus in their bodies and it takes less of that virus to infect another person, there will be higher probability a vaccinated person could transmit these new strains of the coronavirus.<\/span><\/p>\n

If all goes well, vaccines will very soon reduce the rate of severe disease and death worldwide. To be sure, any vaccine that reduces disease severity is also, at the population level, reducing the amount of virus being shed overall. But because of the emergence of new variants, vaccinated people still have the potential to shed and spread the coronavirus to other people, vaccinated or otherwise. This means it will likely take much longer for vaccines to reduce transmission and for populations to reach herd immunity than if these new variants had never emerged. Exactly how long that will take is a balance between how effective vaccines are against emerging strains and how transmissible and infectious these new strains are.<\/span><\/p>\n

Deborah Fuller<\/strong><\/span>
\nProfessor of Microbiology, <\/span>
\nSchool of Medicine, <\/span>
\nUniversity of Washington<\/span><\/p>\n

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* Published in print edition on 12 March 2021<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

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