FILE - In this May 9, 2021, file photo, a security guard wearing a protective mask to help curb the spread of the coronavirus walks in front of the Olympic Rings, in Tokyo. Japan, seriously behind in coronavirus vaccination efforts, is scrambling to boost daily shots as the start of the Olympics in July closes in. (AP Photo/Eugene Hoshiko, File)

TOKYO — It may be too little, too late.

That’s the realization sinking in as Japan scrambles to catch up on a frustratingly slow vaccination drive less than two months before the Summer Olympics, delayed by a year because of the coronavirus pandemic, are scheduled to start.

The Olympics risk becoming an incubator for “a Tokyo variant,” as 15,000 foreign athletes and tens of thousands officials, sponsors and journalists from about 200 countries descend on — and potentially mix with — a largely unvaccinated Japanese population, said Dr. Naoto Ueyama, a physician, head of the Japan Doctors Union.

With infections in Tokyo and other heavily populated areas currently at high levels and hospitals already under strain treating serious cases despite a state of emergency, experts have warned there is little slack in the system.

Even if the country succeeds in meeting its goal of fully vaccinating all 36 million elderly by the end of July — already a week into the Games — about 70 percent of the population would not be inoculated. And many have dismissed the target as overly optimistic anyway.

To meet it, Japan is vowing to soon start administering 1 million doses daily. It currently is only giving 500,000 per day, already a big improvement after Prime Minister Yoshihide Suga called on military doctors and nurses and started making legal exceptions to recruit other vaccinators in order to boost the drive.

“Vaccinations under the current pace are not going to help prevent infections during the Olympics,” Tokyo Medical Association Chairman Haruo Ozaki said. “The Olympics can trigger a global spread of different variants of the virus.”

The International Olympic Committee says more than 80 percent of athletes and staff staying in the Olympic Village on Tokyo Bay will be vaccinated — and they are expected to remain largely in a bubble at the village and venues. On Tuesday, Japan started vaccinating athletes who will go to the Games, the Japanese Olympic Committee said.

But vaccination rates are not clear for others involved in the Games who are coming from abroad, including hard-hit regions, and experts warn that even strict rules won’t prevent all mingling, especially among non-athletes. Spectators from overseas have been barred.

Prominent medical journals have questioned the wisdom of pushing ahead with the Tokyo Games and the Asahi Shimbun — the country’s second-largest newspaper — has called for them to be canceled, reflecting widespread opposition to holding the Olympics now among the Japanese population.

But the government has said it’s determined to push ahead, with the viability of Suga’s leadership and geopolitical competition with rival Beijing, the next Olympics host, as well as the health of millions, on the line.

“By using a new weapon called vaccines and taking firm preventive measures, it is fully possible” to hold the Olympics safely, Suga told a parliamentary session Tuesday.

Officials are now desperately trying to think of ways to increase the shots at a time when medical workers are already under pressure treating COVID-19 patients. Many say they have no extra resources to help with the Olympics, if, for instance, the boiling Japanese summer causes widespread cases of heat stroke. Some local leaders in and around Tokyo have rejected the Olympics organizers’ requests to set aside beds for athletes.

Dr. Shigeru Omi, former World Health Organization regional director and a head of a government taskforce, said it is crucial to start inoculating younger people, who are seen as likely to spread the virus, as soon as possible.

More than three months into Japan’s vaccination campaign, only 2.7 percent of the population has been fully vaccinated. The country started its rollout with health care workers in mid-February, months behind many other countries because Japan required additional clinical testing here, a step many experts say was medically meaningless.

Inoculations for the elderly, who are more likely to suffer serious problems when infected, started in mid-April, but were slowed by initial supply shortages, cumbersome reservation procedures and a lack of medical workers to give shots.

But there are signs of improvement. The vaccine supply has increased and despite earlier expectations of a hesitant response to vaccines in general, senior citizens fearful of the virus are rushing to inoculation sites.