TOKYO — The pressure of hosting an Olympics during a still-active pandemic is beginning to show in Japan.

The games begin July 23, with organizers determined they will go on, even with a reduced number of spectators or possibly none at all. While Japan has made remarkable progress to vaccinate its population against covid-19, the drive is losing steam because of vaccine supply shortages.

With tens of thousands of visitors arriving in a country that is only 13.8{4096c6f39d44714c45f5b36755bfd7eaecf49ae82832f8cdb01e260e21826c23} fully vaccinated, gaps in border controls have emerged, highlighted by the discovery of infections among the newly arrived team from Uganda, with