Can You Spread COVID After Receiving Vaccine? Nine vaccines have proved effective at protecting people from developing symptoms of Covid-19, the disease that can result from infection with the SARS-CoV-2 virus. For the kind caused by the bacteria Neisseria meningitidis, there are many vaccines available for the tens of different strains. But even if vaccinated people don’t get sick, they … But the infection rate was considerably lower than elsewhere (0.04%, while it's estimated that 1.87% of people in England had the virus in the week ending 23 January). It was published in a briefing submitted to the FDA, and has not yet been peer-reviewed. So far, the available Covid-19 vaccines have not been judged primarily on their ability to prevent transmission – though this is now being evaluated as a secondary endpoint for many of them. Occasionally, they can even start epidemics. "It is quite likely that if the vaccines are making people less ill, they are producing less virus, and therefore will be less infectious, but that's just a theory," says Neal. Sterilising immunity is also notoriously tricky to prove. If you liked this story, sign up for the weekly bbc.com features newsletter, called "The Essential List". He explains that it's not yet clear what the herd immunity threshold is, because it hasn't been reached either through natural infection or through vaccination. Masks are vital until we learn more & significantly reduce infections,” he said in a tweet for the White House COVID-19 Response Team account. Before it's here, it's on the Bloomberg Terminal. The evidence isn't clear whether they can spread the virus to others. The trials testing the vaccines weren’t set up to answer those questions first. However, there are a number of reasons to be cautious about interpreting these results, such as the small sample size and the fact that the research was not published in a peer-reviewed journal. “Studies haven’t come out yet about whether you can or cannot spread COVID-19 after getting the vaccine.” In fact, they had a 17% chance of being reinfected. It's likely that he did have some immunity – like the other vaccinated children, he developed relatively mild symptoms with no complications – but he was still able to carry the virus and transmit it to others. So, it's actually quite difficult to separate them out. You can still get infected after you’ve been vaccinated. These results put it in an exclusive club of vaccines that are able to prevent asymptomatic transmission completely in other primates – seen as a promising sign, because they have similar respiratory physiology to humans. Does this mean you can … Take meningitis as an example. It found that while the monkeys were protected from serious illness, it did not prevent them from becoming infected with Covid-19 in the first place. So you've gotten your coronavirus vaccine, waited the two weeks for your immune system to respond to the shot and are now fully vaccinated. On December 18, the U.S. Food and Drug Administration granted Moderna’s COVID-19 vaccine emergency use authorization. After more than 75% of people age 60 or older had received one vaccine dose and only 25% of those between the ages of 40 and 60 had, researchers from Israel’s biggest coronavirus testing lab looked at their data. Some do and some don’t. "In a nutshell we don't know, because they’re too new," says Neal. As a result, vaccinated people can unknowingly carry and spread pathogens. We’re still learning how long COVID-19 vaccines can protect people. Results so far are preliminary. The results were released via a press release, which quotes the head of the study speculating that these powerful immune responses were likely to prevent people from becoming carriers or spreading the disease. Occasionally, they can even start epidemics. A study by the nation’s domestic healthcare provider – Maccabi Healthcare Services – found similarly encouraging results. The completion of the vaccine trials testing for asymptomatic infections will bring additional information. When scientists analysed what had happened, they suggested that the chavrusa style of learning might have allowed for "particularly efficient transmission of mumps virus". What type of immunity do the Covid-19 vaccines provide? After the total number of volunteers with confirmed Covid symptoms in the trial reached a pre-set level, investigators compared the number in each group to determine whether those who got the vaccine fared significantly better than those who received the placebo. One way it might do this is by reducing the number of viral particles in people’s bodies. In fact, most vaccines don't fully protect against infection, even if they can block symptoms from appearing. At present, it is unknown if it will stop you from catching and passing on the virus. In the case of Covid-19, neutralising antibodies that recognise the virus bind to the spike protein on its surface, which it uses to enter cells. So even if vaccinated, you may still be able to spread the virus to vulnerable people. None of the authorized and recommended COVID-19 vaccines or COVID-19 vaccines currently in development in the United States contain the live virus that causes COVID-19. But there are some early signs that it might. The current vaccines are highly effective at preventing people from getting seriously sick with COVID-19. What might seem most surprising in this case is that the accidental super-spreader had received a full course of the MMR (measles, mumps and rubella) vaccine. We are continuing to evaluate the evidence." However, it may prove crucial for those who are unable to be vaccinated, for example because they are pregnant, too young, or too unwell. More recently, the Israeli Ministry of Health (MoH) looked at the health records of a million people in the country, and found that – a week after being fully vaccinated – just 317 people out of 715,425 tested positive for the coronavirus. “If the vaccines don't completely stop transmission, it will increase the amount of people we need to vaccinate to truly cross the herd immunity thresholds and drive down cases to somewhere near zero," says Michael Head, a senior research fellow in global health at the University of Southampton. However, there were limitations to this provisional research – the number of people who tested positive was small, so the estimate may not be entirely accurate. Join one million Future fans by liking us on Facebook, or follow us on Twitter or Instagram. The latter is the aspiration of all vaccine research, but surprisingly rarely achieved. But your chances of getting seriously ill are almost zero. The vaccine for measles, for example, provides it; the one for hepatitis B does not. Now scientists are waiting to find out if the vaccine can achieve sterilising immunity in vaccinated humans, too. Can you still transmit Covid-19 after vaccination? There are some early hints that certain vaccines might be able to reduce transmission, even if they can’t eliminate it entirely. This means that a … Yes, you can, but the answer is also a bit more complicated The 400 children in attendance spent hours each day engaging in prolonged face-to-face contact – specifically, a kind of Orthodox Jewish education involving facing a study partner, a chavrusa, across a narrow table, while analysing and debating text from the Talmud. But a question that there’s still no solid answer to is whether people who’ve been vaccinated can still carry the virus and potentially spread it to others. Zaria Gorvett is a senior journalist for BBC Future and tweets @ZariaGorvett. Published ... "Even after you have had both doses of the vaccine you may still give Covid-19 … "Effective" or "sterilising" immunity . “Right now, you still need to wear a mask and practice social distancing after getting vaccinated,” says Kinzi Shewmake, M.D., a Piedmont family medicine physician. These studies aren’t as reliable as those in which participants are randomly assigned to a vaccine or placebo group, but when done well they offer important evidence. The company revealed that it prevented the virus spreading entirely during studies in rhesus macaques, when they were given a high enough dose. "Even if you vaccinate, you've still got a fairly large number of susceptible people there,” says Head. But it’s not always achieved. 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