The federal government’s disease-tracking agency has paused its diagnostic testing for rabies, monkeypox and a number of other infectious diseases.

The Centers for Disease Control and Prevention this week posted a list of more than two dozen types of testing that have become unavailable.

This is not the first time the CDC has paused some of its lab testing. But it is pausing more kinds of tests than ever before, and it is not totally clear why, said Scott Becker, chief executive officer of the Association of Public Health Laboratories.