Da Nang’s C Hospital, where patient 416 tests positive for coronavirus for the first time.

"Patient 416" is a 57-year-old man who had tested positive for the novel coronavirus five times as of Saturday morning, the National Institute of Hygiene and Epidemiology said.

The patient is a retired man living with 4 other family members in Lien Chieu District. He said he has not left Da Nang in recent months, but went to three healthcare facilities and attended a wedding in Hai Chau District from July 7 to July 20.

On the morning of July 20, he visited Hospital C in Da Nang with fever, cough and phlegm. After diagnosing him with pneumonia, doctors took his samples to test for COVID-19, and the result turned up positive.

He had been transferred to the Da Nang Hospital after his condition worsened. 

Authorities have yet to confirm the source of transmission.

105 people who had had close contact with the patient have been tested by the Da Nang Center for Disease Control (CDC), all coming back negative.

Da Nang authorities have put Hospital C under lockdown, with no admissions or discharges allowed. The city has closed its airport from international flights and is preparing large-scale testing among the community.

With the Da Nang case confirmed, Vietnam now has 51 active cases.