The CDC says the new Covid strain in the U.K. could already be circulating undetected in the United States. Dr. Atul Gawande, surgeon at Brigham and women's hospital and a staff writer for the New Yorker and member of President-elect Joe Biden's coronavirus advisory board, joined "Squawk Box" on Tuesday to discuss. For access to live and exclusive video from CNBC subscribe to CNBC PRO: https://cnb.cx/2NGeIvi World Health Organization officials said Monday that the coronavirus is mutating “at a much slower rate” than seasonal influenza, even as officials in the U.K. announced this weekend that a new mutation of the virus is allowing it to spread more easily. Seasonal influenza mutates so often that scientists have to regularly develop new vaccines to inoculate the population against the virus every year. U.K. officials have told the WHO that the Covid-19 vaccines appear to be just as effective against the new strain, but more research is needed. While all viruses naturally mutate, not every mutation makes a virus more contagious or more virulent. “SARS-CoV-2 is mutating at a much slower rate than influenza,” WHO chief scientist Soumya Swaminathan said at a press briefing. “And so far, even though we’ve seen a number of changes and a number of mutations, none has made a significant impact on either the susceptibility of the virus to any of the currently used therapeutics, drugs, or the vaccines under development, and one hopes that that will continue to be the case.” WHO officials reiterated that officials from the U.K. have said the new variant could be up to 70% more transmissible than the original strain of the virus. Dr. Mike Ryan, executive director of the WHO’s health emergencies program, said it was unclear if the increase in spread in the U.K. is due to the mutation or human behavior. “We’ve seen an estimate of a small increase in the reproductive number by the U.K.,” he said, meaning the virus is spreading faster, which could mean it is more contagious or spreads more easily in colder months. It could also mean people are getting lax about following public health protocols. “It remains to be seen how much of that is due to the specific genetic change in the new variant. I suspect some.” » Subscribe to CNBC TV: https://cnb.cx/SubscribeCNBCtelevision » Subscribe to CNBC: https://cnb.cx/SubscribeCNBC » Subscribe to CNBC Classic: https://cnb.cx/SubscribeCNBCclassic Turn to CNBC TV for the latest stock market news and analysis. From market futures to live price updates CNBC is the leader in business news worldwide. The News with Shepard Smith is CNBC’s daily news podcast providing deep, non-partisan coverage and perspective on the day’s most important stories. Available to listen by 8:30pm ET / 5:30pm PT daily beginning September 30: https://www.cnbc.com/2020/09/29/the-news-with-shepard-smith-podcast.html?__source=youtube%7Cshepsmith%7Cpodcast Connect with CNBC News Online Get the latest news: http://www.cnbc.com/ Follow CNBC on LinkedIn: https://cnb.cx/LinkedInCNBC Follow CNBC News on Facebook: https://cnb.cx/LikeCNBC Follow CNBC News on Twitter: https://cnb.cx/FollowCNBC Follow CNBC News on Instagram: https://cnb.cx/InstagramCNBC https://www.cnbc.com/select/best-credit-cards/ #CNBC #CNBCTV