Health authorities on Thursday reported 13 new coronavirus infections, all but one locally acquired.

Among the local cases, officials said three of them had no clear source of transmission.

They include a 34-year-old salesperson, who developed a fever last Friday, and a 62-year-old quality control worker who came down with a fever on Monday but continued working until Wednesday.

The third case, meanwhile, involves a 16-year-old student who sought treatment after feeling dizzy on Tuesday.

The only imported case is a 45-year-old woman from Indonesia.

The latest infections bring Hong Kong's Covid-19 tally to 10,926.