My apologies for a RT of a RT of a RT - required because commenting directly to Dr. Saxinger would result in typos, etc (looking for our edit button, @jack).
And Dr. Saxinger has a great point here, which deserves an adequate response.
"VZV (human herpesvirus 3) is a ubiquitous, exclusively human DNA virus. Primary infection occurs via respiratory aerosols or contact with vesicles from an infected individual and results in the characteristic disseminated rash of ...chickenpox."
If the athletes get the best vaccines, you will have many stories in the Japanese press about the deaths of the Japanese while the athletes enjoy the beauty of Japan.
If they don't get the best, then you will have the vaccine inequity stories. "USA wins again thanks to Pfizer!"
Plus, there will bound to be poorer nation athletes who get drastically sick in Japan.