With a dearth of resources, the Office for Civil Rights is struggling with an overflowing caseload.

The online reviews site Yelp said Tuesday it is rolling out a new feature to protect users seeking abortions from being misled about anti-abortion pregnancy centers listed on its platform. Such centers are typically religiously affiliated and deter clients from having an abortion.

It’s a phenomenon known by the forbidding name of original antigenic sin, and, in the case of the coronavirus, it prompts a constellation of questions.