Elderly people go out of the newly-opened mass vaccination center after receiving the Moderna coronavirus vaccine in Tokyo, Monday, May 24, 2021. Japan mobilized military doctors and nurses to give shots to elderly people in Tokyo and Osaka on Monday as the government desperately tries to accelerate its vaccination rollout and curb coronavirus infections just two months before hosting the Olympics. (AP Photo/Koji Sasahara)

People wait to be processed after arriving to receive the Moderna coronavirus vaccine at the newly-opened mass vaccination center in Osaka, western Japan, Monday, May 24, 2021. Japan mobilized military doctors and nurses to give shots to elderly people in Tokyo and Osaka on Monday as the government desperately tries to accelerate its vaccination rollout and curb coronavirus infections just two months before hosting the Olympics. (Kyodo News via AP)

Elderly residents of Sumida Ward rest at box seats after receiving their first dose of Pfizer's COVID-19 vaccine at the Ryogoku Kokugikan sporting arena, in Tokyo Monday May 24, 2021. The arena, mainly used for sumo wrestling tournaments, is used as temporary inoculation venue for local residents age over 65 years old. (AP Photo/Eugene Hoshiko)

People are guided at a mass vaccination center in Tokyo, Monday, May 24, 2021. Japan mobilized military doctors and nurses to give shots to elderly people in Tokyo and Osaka on Monday as the government desperately tries to accelerate its vaccination rollout and curb coronavirus infections just two months before hosting the Olympics. People inoculated at the centers on Monday were the first in Japan to receive doses from Moderna Inc., one of two foreign-developed vaccines Japan approved on Friday.(AP Photo/Koji Sasahara)

A nurse waits in an observation room to watch for adverse effects in people who have just received the Moderna coronavirus vaccine at the newly-opened mass vaccination center in Tokyo Monay, May 24, 2021. Japan opened mass-vaccination sites in two of the country’s biggest metropolitan areas, Tokyo and Osaka, with the goal of administering the shots to up to 15,000 elderly people a day. (Carl Carl Court/Pool Photo via AP)

A nurse waits to inoculate people with the Moderna coronavirus vaccine at the newly-opened mass vaccination center in Tokyo Monay, May 24, 2021. Japan opened mass-vaccination sites in two of the country’s biggest metropolitan areas, Tokyo and Osaka, with the goal of administering the shots to up to 15,000 elderly people a day. The Japanese plates at top read: "Inoculation." (Carl Carl Court/Pool Photo via AP)

Elderly residents of Sumida Ward wait at the standby station to receive their first dose of Pfizer's COVID-19 vaccine at the Ryogoku Kokugikan sporting arena, in Tokyo on Monday May 24, 2021. The arena, mainly used for sumo wrestling tournaments, is used as temporary inoculation venue for local residents age over 65 years old. (AP Photo/Eugene Hoshiko)

People enter the newly-opened mass vaccination center to receive the Moderna coronavirus vaccine in Tokyo, Monday, May 24, 2021. Japan mobilized military doctors and nurses to give shots to elderly people in Tokyo and Osaka on Monday as the government desperately tries to accelerate its vaccination rollout and curb coronavirus infections just two months before hosting the Olympics. (AP Photo/Koji Sasahara)

The mass vaccination center for people to receive the Moderna coronavirus vaccine opens in Osaka, western Japan, Monday, May 24, 2021. Japan mobilized military doctors and nurses to give shots to elderly people in Tokyo and Osaka on Monday as the government desperately tries to accelerate its vaccination rollout and curb coronavirus infections just two months before hosting the Olympics. (Kyodo News via AP)

A woman enters a mass vaccination center in Tokyo, Monday, May 24, 2021. Japan mobilized military doctors and nurses to give shots to elderly people in Tokyo and Osaka on Monday as the government desperately tries to accelerate its vaccination rollout and curb coronavirus infections just two months before hosting the Olympics.(AP Photo/Koji Sasahara)

Nurses wait to process people arriving to receive the Moderna coronavirus vaccine at the newly-opened mass vaccination center in Tokyo Monay, May 24, 2021. Japan opened mass-vaccination sites in two of the country’s biggest metropolitan areas, Tokyo and Osaka, with the goal of administering the shots to up to 15,000 elderly people a day. (Carl Carl Court/Pool Photo via AP)

People wait to be processed after arriving to receive the Moderna coronavirus vaccine at the newly-opened mass vaccination center in Tokyo Monay, May 24, 2021. Japan opened mass-vaccination sites in two of the country’s biggest metropolitan areas, Tokyo and Osaka, with the goal of administering the shots to up to 15,000 elderly people a day. (Carl Carl Court/Pool Photo via AP)