“Ardehali cautions that the study’s observational nature comes with some limitations. For example, people in the contemporary control group weren’t tested for C

“Ardehali cautions that the study’s observational nature comes with some limitations. For example, people in the contemporary control group weren’t tested for COVID-19, so it’s possible that some of them actually had mild infections. And because the authors considered only VA patients — a group that’s predominantly white and male — their results might not translate to all populations.” This might sound like minor information, but it calls the conclusions and broad claims into question. In fact, it’s a very narrow study.