Eight people in Tokyo, three more who have connections to a hospital in Wakayama Prefecture and one person in Nagoya tested positive for COVID-19 on Saturday as Japan struggles with a daily increase in the number of domestic cases of the virus.

Seven of the eight people in Tokyo had had close contact with a taxi driver who this week tested positive for the coronavirus, the Tokyo Metropolitan Government said.

The remaining person in Tokyo is a businessman in his 40s and is in serious condition in hospital. After showing symptoms such as coughing and fever last Monday, the man made a business trip on a Tokaido Shinkansen bullet train to Aichi Prefecture, metro officials said, adding that he has not traveled to China recently.