Several of Japan’s biggest municipalities, including parts of Tokyo and Osaka, have stopped taking new reservations for COVID-19 vaccinations in the latest hiccup for the country’s effort to vaccinate its people, with the Tokyo Olympics just two weeks away.

The bottlenecks in distribution are sowing confusion among vaccine seekers, complicating a vaccination campaign that has sped up rapidly in recent weeks after criticism over a slow start.

Unlike many places around the world, Japan has an abundant supply of vaccines nationwide — as of the end of June, the country had received 100 million doses of the Pfizer vaccine, of which 44 million had been administered. Rather, the issue appears to be a misallocation of shots, with too many doses going to places where demand is low, while others run out.

In total Japan has given 52.6 million doses, enough to cover about 21% of the population, according to Bloomberg’s vaccine tracker.

Japan’s inoculation rollout is in the spotlight as infections rise again, particularly in Tokyo, prompting the return of a state of emergency in the capital. While vaccination pace has accelerated to more than 1 million doses per day, Japan’s campaign is still far behind other developed countries.

Nerima, the second most populous of central Tokyo’s borough-like wards, is getting less than half the number of doses it requested for the period from July 5 to Aug. 1, according to a spokesman. The ward has had to suspend new reservations at the vaccination centers it runs, as well as instruct private clinics to keep new appointments to a minimum as supply wanes.

"Since we cannot foresee the specific amount of vaccine supply at the moment, we would like the government to quickly show us when and how much vaccine will be supplied,” said Yuta Okano, public relations strategist at the mayor’s office in Nerima, which is home to about 740,000 people.

To combat the asymmetry in distribution, the government said late last Friday it would prioritize shipping vaccines to municipalities that have little inventory left for its shipments in August. According to the health ministry, locations with more than six weeks of inventory will have their future shipments cut by 10%. Until recently, doses had been dispensed based on municipal requests and population.

”From now on we’ll distribute more doses to places that are ahead in vaccinations, and we’ll make the size of the shipments clear to them as early as possible,” Prime Minister Yoshihide Suga said Thursday.

The speed of vaccine administration in municipalities is now faster than the pace of supply coming through from the national government, said Osaka Gov. Hirofumi Yoshimura last Friday. He added that urban centers should be prioritized for faster vaccinations as the virus spreads faster in those areas.

Further complicating the task is the fact that a centralized vaccination registry system has not been updated promptly, according to reports from the Asahi Shimbun and other local media. The arcane recording system relies on individuals receiving vouchers by mail to confirm their eligibility for shots. Some places are vaccinating people without vouchers first, assuming they’ll receive them later, and these doses aren’t promptly reflected in the system.

The government revealed Thursday that the usage rate for Pfizer's vaccine doses that have been supplied to prefectures is under 50% in Tokyo and Osaka Prefecture.

Osaka Prefecture has the lowest level, at 45.5%, followed by Tokyo, at 45.8%, and Hokkaido, at 46.2%.

Municipalities' vaccination programs are progressing at different speeds, even within the same prefecture.

"There are enough doses in total," health minister Norihisa Tamura said at an off-session committee meeting of the House of Councillors, the upper chamber of parliament. "We'll respond properly, including supplying (doses) to places that are making progress in inoculations."

The vaccine usage rate was highest in Miyazaki Prefecture, at 67.8%, followed by Saga Prefecture, at 65.8%, and Gifu Prefecture, at 65.4%.

Moderna's vaccine is also being deployed, with most of the 50 million doses set to go to inoculation campaigns through workplaces and universities. Vaccine minister Taro Kono revealed on Tuesday that the number of Moderna shots coming into the country through the end of June had been cut to less than half of an initial target, but the remaining doses will arrive by the end of September.

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