Japan is to impose a state of emergency in Tokyo and six other prefectures as early as Tuesday to try to stop the coronavirus, the prime minister said, with the government preparing a 990-billion-U.S.-dollar stimulus package to soften the economic blow.

More than 3,500 people have tested positive for the coronavirus in Japan and 85 have died - not a huge outbreak compared with some hot spots. But the numbers keep rising with particular alarm over the spread in Tokyo, which has more than 1,000 cases, including 83 new ones on Monday.

"Given the state of crisis on the medical front, the government was advised to prepare to declare the state of emergency," Prime Minister Shinzo Abe told reporters.

An emergency, which Abe said would last about a month, will give governors the authority to call on people to stay at home and businesses to close, but will not be as restrictive as lockdowns in some other countries.

Abe also said the government has decided to launch a stimulus package of about 108 trillion yen, including more than six trillion yen for cash payouts to households and small businesses and 26 trillion yen to allow deferred social security and tax payments.

It was not immediately clear how much of that package would be new government spending.

"The government wants to help businesses continue and protect jobs," Abe said.

An emergency appears to have public support. In a poll published on Monday by JNN, run by broadcaster TBS, 80 percent of those surveyed said Abe should declare it while 12 percent said it was not necessary. His approval rating fell by 5.7 points from last month to 43.2 percent, the survey showed.

But Kenji Shibuya, director of the Institute for Public Health at King’s College, London, said the emergency was too late given the explosive increase in cases in Tokyo.

"It should have been declared by April 1 at the latest," he said.