President Biden touring a lab at the National Institutes of Health on Thursday.Credit…Pete Marovich for The New York Times The Biden administration says it has now secured enough vaccine to inoculate every American adult, but President Biden warned that logistical hurdles would most likely mean that many Americans will still not have been vaccinated by the end of the summer. Officials said Thursday that they had arranged to get 200 million more doses of vaccine by the end of summer, which amounts to a 50 percent increase. That should be enough vaccine to cover 300 million people. But it will still be difficult to get those shots into people’s arms, and Mr. Biden lamented the “gigantic” logistical challenge his administration faces during an appearance at the National Institutes of Health. “It’s one thing to have the vaccine, it’s another thing to have vaccinators,” Mr. Biden said. Mr. Biden also […]