Fears of a potential monkeypox outbreak led a Delta flight to be quarantined for more than two hours Thursday afternoon in Chicago, but federal health officials later determined there was “very little risk” to passengers.

The Centers for Disease Control and Prevention said in a statement that “based on the patient’s symptoms and photographs of the rash, it does not appear that the signs and symptoms are consistent with a monkeypox infection.”

The ill passenger, who had been travelling in Africa, was released from the plane before others on board were allowed to disembark. Health officials said there is “very little risk to other passengers.”

Flight 3163 was coming from Detroit, and landed at Midway International Airport in Chicago at about 3:45 local time. The plane was met with emergency crews and the Chicago Department of Public Health, said Chicago Department of Aviation spokeswoman Karen Pride.

The CDC also investigated. Monkeypox is a rare viral disease, the CDC says, with the first outbreak in the U.S. in 2003.

A passenger tweeted pictures of emergency crews on board the flight through the afternoon.

“Still in quarantine. They say it’s not serious...pff,” tweeted user Kayla Maree Sanders.

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