A floor is crowded with elderly people who want to make a reservation for the coronavirus vaccine in Kochi, western Japan on April 23, 2021. Japan's rollout of COVID-19 vaccines began belatedly in mid-February, months behind the United States and many other countries. Officials blamed a shortage of Pfizer Inc. vaccine from Europe as the main culprit in the delay. But three months later, with shipments stabilized and officials attempting to accelerate vaccinations, Japan remains one of the world's least protected. (Kyodo News via AP)