Federal health officials are monitoring the outbreak of a deadly and mysterious disease in the Democratic Republic of Congo, the U.S. Centers for Disease Control and Prevention confirmed to UPI.

With 180 more people now being told they can return, the actual number of CDC employees terminated so far would seem to stand somewhere around 550. But federal health officials haven’t confirmed any specifics.

The Centers for Disease Control and Prevention reinstated 180 probationary employees weeks after they were fired as part of the Department of Government Efficiency‘s efforts to reduce the federal workforce.

About 180 ex-employees of the Centers for Disease Control and Prevention were called back to work Tuesday — just two weeks after a round of layoffs ordered by the Trump administration, according to a report.