TOKYO — Japan expanded a coronavirus state of emergency for seven more prefectures Wednesday, affecting more than half the population amid a surge in infections across the country.

Prime Minister Yoshide Suga also said Japan will suspend fast-track entry exceptions for business visitors or others with residency permits, fully banning foreign visitors while the state of emergency is in place.

Suga’s announcement comes less than a week after he declared a state of emergency for Tokyo and three nearby prefectures. The new declaration, which adds seven other prefectures in western and central Japan, takes effect Thursday and lasts until Feb. 7.

“The severe situation is continuing, but these measures are indispensable to turn the tide for the better,” Suga told a news conference, bowing as he sought understanding from the public.

Suga said he put the seven prefectures in urban areas under the state of emergency to prevent the infections from spilling over to smaller cities where medical systems are more vulnerable.