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The vaccine contains two common cold viruses, or adenoviruses, that have been modified so they don't replicate in humans; the modified viruses also contain genes that code for the coronavirus's spike protein.11 (sometimes) deadly diseases that hopped across species14 coronavirus myths busted by scienceThe 12 deadliest viruses on Earth In November, Russia announced that the vaccine is more than 91.4% effective in preventing COVID-19, according to early data from clinical trials. mcm 15 off CLICK HERE TO SIGN UP FOR OUR LIFESTYLE NEWSLETTER In the letter, campaign organizers also suggested several potential "safeguards" that international travelers could be asked to follow in order to visit the country, including "showing officially recognized proof of a Covid-19 vaccination from their home country, purchasing health insurance, showing proof of a negative Covid test within 72 hours of departure, and so on," the letter said. mcm 15 off nbsp;More from OpinionNewt Gingrich: Rush Limbaugh was one of the conservative movement's great heroic figures and a good friendTim Graham: New York's nursing home deaths and Andrew Cuomo, crumbling media darlingLindsey Burke: Biden backtracks on school reopenings – here's how left, unions put ideology before studentsOne of the many reasons Rush skyrocketed in the ratings and into radio royalty was because he wasn’t afraid to tell you what he believed – and why you should believe it, too. mcm 15 off Gameweek 24 ranking – WatchlistMatch performance – one assist and Swansea’s lynchpinGoals involved in since Gameweek 14 – 8AdvertisementThe Swansea midfield wizard has been in terrific form ever since Paul Clement took over as Swansea boss and he picked another assist against reigning champions Leicester City when he outstretched his left foot to guide the ball towards Martin Olsson who scored Swansea’s second goal. mcm 15 off