The 25-year-old man lives in Da Nang's Lien Chieu District with 12 other people, some of whom have also tested positive, according to the city Steering Committee for Covid-19 Prevention and Control.
He flew to HCMC on April 30 by Vietnam Airlines flight VN113 at 9:10 a.m. He was driven by a friend to another friend's house in Binh Tan District, then to a karaoke parlor in Tan Phu District, Nguyen Hue pedestrians-only street in District 1, and a cafe in Tan Binh District.
On May 1 he ate breakfast at a pho restaurant in Binh Tan and went to a café, but whose names and addresses he could not remember.
He visited a beef noodle place in Tan Phu for lunch and went to the Landmark 81 Building in Binh Thanh District in the afternoon.
At around 7:30 p.m. he traveled to the Anh Sao Bridge in the Phu My Hung urban area in District 7, another popular destination in the city, before finishing off for the night at a restaurant in Binh Tan.
On May 2 he ate breakfast at a restaurant in Binh Tan and then went to the same cafe as the previous morning.
He had lunch at a restaurant on Ngo Chi Quoc Street in Thu Duc City and went to a cafe in Thu Duc after playing billiards at an unidentified place.
He went to a motel in Binh Tan District, a Highland Coffee outlet and a noodles restaurant in District 12 and another cafe in Phu Nhuan.
On May 3 he went to Galaxy Tan Binh cinema in Tan Binh District for an afternoon show, then went to a restaurant in Tan Phu and another restaurant in the same district that night.
On May 4 he had breakfast near his hotel before flying back to Da Nang by Vietnam Airlines flight VN136 at 6:25 p.m.
Since May 5 he has been going to work and traveling around Da Nang.
On May 7 his sister who lives with him tested positive for the coronavirus, and so he was placed in quarantine where he tested positive.
Da Nang, a popular tourist destination, has had 48 Covid cases since late last month when the fourth wave began. The central city had been the epicenter of an earlier wave last year.
HCMC has had only one case of local transmission in the new wave.
Nationwide, there have been 411 in 26 cities and provinces.
On Sunday 92 people were diagnosed with the disease, the highest single-day tally since the disease first appeared more than a year ago.