Travelers are screened for potential coronavirus infection at Suvarnabhumi Airport on Jan. 17, 2020.

BANGKOK — Health officials on Wednesday said they found the first case of a Thai national who contracted the new strain of coronavirus, and the fourth infection in Thailand.

Department of Disease Control director Sophon Iamsirithavorn identified the patient as a 73-year-old female native of Nakhon Pathom province who returned from a trip to the Chinese city of Wuhan back on Jan. 13. Wuhan is thought to be where the strain originated.

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He said there have now been four confirmed cases of coronavirus infection in Thailand: three Chinese tourists and one Thai citizen. The announcement just as Macau and the U.S. also reported an infection.

Symptoms of the virus are similar to a flu: runny nose, cough, sore throat, headache, and fever.

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The virus could also lead to illnesses like pneumonia or bronchitis if the patient has weakened immune system, such as children and the elderly.