| How many shots does it take to be fully vaccinated against Covid-19? Like so many things about this pandemic, the answer isn't simple. Full vaccination could require one, two or even three doses, depending on where you are in the world, which vaccine you got and whether you've already had the virus. Less than two weeks before a proposed rollout of booster shots, the U.S. is enmeshed in a debate over whether an extra dose is really necessary for most people. White House chief medical adviser Anthony Fauci said last week that if the immune boost observed in a recent study with the Pfizer Inc.-BioNTech SE vaccine in Israel is shown to last, "you're going to have very likely a three-dose regimen being the routine." But that's by no means the consensus. Other public-health experts have put on the brakes, saying that politics might be getting ahead of the process.  Pfizer's vaccine being defrosted before it can be given to patients in Belgium. Photographer: Vincent Kalut/Photonews via Getty Images Europe has taken a more nuanced approach. The U.K. and European Union health regulators have said additional doses should be reserved for those who need them most — cancer and organ-transplant patients, for example, as well as the very old and frail — and that the focus should be on getting more people fully vaccinated instead of giving boosters to healthy people who've already had their shots. Meanwhile, in a number of EU countries, people who've already had Covid count as fully vaccinated after just one shot of the two-dose regimens. With vaccine passports in wide use, that caveat makes a difference, allowing a quicker path to freedom for everything from travel to indoor dining for those who can prove they've already recovered. The one-shot rule is based on studies showing robust immune responses to a single vaccine dose in people who have recovered. Thanks to tests developed by Roche Holding AG and others, doctors can quickly determine an individual's level of virus antibodies. Ultimately, it's this kind of measurement, not an arbitrary number of shots, that may determine who counts as fully vaccinated. —Naomi Kresge | 
⇉〖OpenLoad〗 2020 Superintelligence Película Completa En Línea released 2020. story: La vida de Carol Peters se trastorna cuando es selecci...
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