Vietnam recorded a whopping daily increase of 64 domestic coronavirus infections on Thursday, one-third linked to a hospital in Hanoi, according to the Ministry of Health.

Twenty-four of the cases were registered at the Dong Anh District branch of the National Hospital for Tropical Diseases in Hanoi, 11 in Vinh Phuc Province, five in Thai Binh Province, 12 in Bac Ninh Province, four in other venues in the capital city, one in Hai Duong Province, two in Hung Yen Province, and one in Quang Ngai Province, the health ministry said in a report on Thursday.

Hanoi is at ‘very high’ risk of COVID-19 spread as the latest patients have visited many places and had contact with a lot of people, Hoang Duc Hanh, deputy director of the municipal Department of Health, said the same day.

The Vietnamese capital has logged 47 community cases since Tuesday, including 42 infections at the said hospital, which is also designated as a COVID-19 treatment facility.

At least 52 patients in 15 provinces and cities can be traced back to the hospital in this latest outbreak, which started hitting Vietnam on April 27 after the country had spent over a month detecting zero local cases.

A total of 120 domestically-transmitted cases have been confirmed since then.

Hanoi, Ho Chi Minh City, and other provinces have closed non-essential services such as karaoke parlors, nightclubs, discos, and online game centers to curb the virus.

The health ministry also announced four imported cases on Thursday, all having been quarantined since their arrival in Vietnam.

The ministry on Wednesday decided to increase centralized quarantine time to 21 days from the previous 14-day period, as there had been cases where people were confirmed as coronavirus patients shortly after leaving isolation centers.

The new regulation has been applicable from the same day.

Vietnam has logged 3,090 coronavirus patients, including 1,690 local cases, since the virus first struck the country on January 23, 2020, according to the health ministry’s data.

Recoveries have numbered 2,560, while 35 patients have died, most suffering critical underlying conditions.

Vietnam has recorded no virus-related fatalities for months on end.