The Centers for Disease Control and Prevention (CDC) has confirmed nearly 900 cases of mumps at adult migrant detention facilities in the past 12 months.

The contagious disease infected 898 migrants detained by ICE in 57 facilities between Sept. 1, 2018, and Aug. 22, the CDC said Thursday.

An additional 33 staff members were also infected, the CDC said.

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Most of the facilities that saw mumps outbreaks were run by private companies, while 19 were county jails and four were operated by ICE.

Almost 400 of the cases were reported from facilities that house ICE detainees in Texas.

The CDC said most detainees caught the virus while in the custody of ICE or another U.S. agency.

It's the first report of mumps outbreaks in migrant detention facilities, and 94 percent of those infected are men.

Mumps outbreaks are uncommon in the U.S., but the disease is easily transmittable in spaces where people have close, prolonged contact.

Since 2015, there have been 50 mumps outbreaks in the U.S., or 16,000 cases.

The disease is preventable with a vaccine, but the CDC noted that vaccination efforts "differ among detention facilities."

The agency recommended facilities follow local or state health department recommendations for preventing and responding to mumps.

Detainees and staff members at an "increased risk" for mumps should be offered the vaccine, the CDC said.

As of Aug. 22, there were ongoing mumps outbreaks in 15 facilities in seven states.

Mumps can cause fever, headaches and muscle aches. Complications, while rare, could include inflamed testicles and brain, fluid around the brain and spinal cord, and pancreatitis.

The CDC reported that 527 male patients reported testicle inflammation and at least 13 patients were hospitalized.