Millions of New Yorkers recently woke up to a message on their phone — from an app they most likely forgot they ever even downloaded. “Because demand for instant access to vaccine records has subsided ...

The latest outbreak of mpox in central Africa is serving as a reminder of the disruptive potential of public health crises. Fortunately, experts say that vaccine credential work done during and since ...

All travelers who want to fly to the U.S. are required to present proof of a negative Covid-19 test. For now, that proof takes the form of a printout of a test result, or a photo of that result — ...