Medical staff and elderly care workers in Tokyo began to receive their fourth COVID-19 vaccinations on Saturday after the government expanded its eligibility criteria in response to Japan's seventh wave of infections.Last week's decision to begin the vaccinations was aimed at ensuring enough medical and care workers are available when Japan is seeing record numbers of new cases driven by the spread of the BA.5 Omicron subvariant.Some medical institutions in the capital have been forced to limit the number of emergency patients they accept and scale back surgical procedures they conduct due …READ FULL ARTICLE