This article was published more than 2 years agoCommentGift ShareMutations in the novel coronavirus and the sudden appearance of the highly contagious have become a top concern of scientists and public health officials in the United States, who are vowing to improve the spotty surveillance of the pathogen as it adapts to its human host and potentially becomes a more elusive target for vaccines.Infectious-disease experts say there is no evidence the massive winter surge that is killing thousands of people a day in the United States is linked to the U.K. variant or to a homegrown strain....…This article was published more than 2 years agoCommentGift ShareMutations in the novel coronavirus and the sudden appearance of the highly contagious have become a top concern of scientists and public health officials in the United States, who are vowing to improve the spotty surveillance of the pathogen as it adapts to its human host and potentially becomes a more elusive target for vaccines.Infectious-disease experts say there is no evidence the massive winter surge that is killing thousands of people a day in the United States is linked to the U.K. variant or to a homegrown strain....WW…