President Joe Biden, not wearing a mask, days before testing positive for Covid-19.Susan Walsh/AP

President Joe Biden recently got Covid-19 for a second confirmed time this week—along with many other people across the United States, with wastewater showing surges in multiple states.

Given how many people the president sees and interacts with, it might be surprising that he hasn’t had Covid more often. The difference: this is the first major Covid wave where people around the president are no longer regularly testing. From his inauguration through March of this year, anyone visiting Biden at the White House had to test for Covid-19. Then the administration ended that practice—and Biden promptly got it again, a cautionary tale that drives home........

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