Organizers site predictions that the coronavirus will peak in June. They are not offering refunds for the $110-$135 entry fee or deferred entry for next year's race.
Haruyuki Takahasi admits to giving gifts (including digital cameras and Seiko watches) to lobby IOC officials including Lamine Diack. Takahasi was paid $8.2 million by the Tokyo bid committee to "wine and dine" people who could help Tokyo win the Olympics.
So many events from March through July have been postponed or cancelled.
Most of this info is common sense or well known health facts, but they do advise that if you get coronavirus you don't return to exercise too soon as there is a risk it could cause heart and/or lung complications.