A Korean woman has been diagnosed with Zika after working in Vietnam, according to a local official.

The foreigner, 25, was infected with Zika during one month working in Vietnam before returning to South Korea on May 1, Tran Dac Phu, director of the Department of Preventive Medicine under the Vietnamese Ministry of Health, confirmed.

The patient was found positive for the disease after conducting a health test on May 4, Phu said, noting that this has been the third case in Vietnam since April, when two Vietnamese women in Khanh Hoa, a south-central province, and Ho Chi Minh City were discovered contracting the disease.

This is the fourth Zika patient that has been confirmed in South Korea, he added.

Phu said that the department is tracking places where the patient had traveled in Vietnam to identify the hotbed of the disease and enact measures to prevent an epidemic outbreak.

Zika is a disease caused by the Zika virus and is spread primarily through bites from infected Aedes mosquitoes. Common symptoms include fever, rash, joint pain, and conjunctivitis (red eyes), according to the U.S. Centers for Disease Control and Prevention.

The virus is now infamous for the large numbers of babies born with brain damage in Brazil and the increase in Guillan-Barré syndrome, a nerve disorder, experts at the World Health Organization (WHO) said, adding that urgent action is needed to deal with the growing crisis.

There is no specific treatment or vaccine currently available for the disease, the WHO said on its website.

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