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A medical professional who conducted passenger screenings at Los Angeles International Airport tested positive for the coronavirus late Tuesday , according to the Department of Homeland Security and an internal email obtained by NBC News.

The person last worked screening air travelers for illness on Feb. 21, DHS said in a statement, which also said the medical professional had worn the proper protective gear while working. The internal email described the person as a "contract medical screener" for the Centers for Disease Control and Prevention.

The email also said "these screeners are predominantly assigned to the CDC in-transit lounge and a few support jetway screening on direct flights from China."

In its statement, DHS said: "Late last night, DHS headquarters was alerted to a situation where one of our contracted medical professionals conducting screenings at LAX international airport had tested positive for COVID-19, also known as the coronavirus. This individual is currently under self-quarantine at home with mild symptoms and under medical supervision. Their immediate family is also under home quarantine."

According to DHS, the person began to exhibit cold-like symptoms Saturday and visited a primary care doctor Sunday. The person was tested for COVID-19, which came back positive Tuesday.

The person's last shift at LAX was Feb. 21, more than a week before the appearance of symptoms. According to the internal email, the screener worked at LAX from Feb. 14 to 21 and became symptomatic on Feb. 29.

"DHS is happy to report that this individual was highly trained and did everything right both on the job and when they began to feel sick," DHS said. "We are told the individual wore all the correct protective equipment and took necessary protections on the job. Additionally, as soon as the individual began to feel sick, they self-quarantined, saw a physician, and reported to the appropriate authorities and officials."

DHS said it is working to communicate with the person's co-workers and to trace contacts.

"At this time we do not know if this case is a result from community spread or through their work as a medical screener," DHS said. "There have been no positive COVID-19 detections reported from the LAX screened travelers. This is an evolving situation that the CDC, DHS and county public health officials continue to examine."