Olympicofficialshavesaidthatvaccinationswillnotbe a prerequisiteforathleteshopingtocompeteinthesegames, buttherewillberulesthattheyhavetofollow.
Thoseruleswillbelaidoutin a SirisofplaybooksexpectedtobereleasedasearlyastomorrowexplaininghowJapanplanstoprotectthehealthofathletes, coachesandothers.
I'm StevenZhanginBeijing.
A teamofWorldHealthOrganizationexpertsarecontinuingtheircloselywatchedinvestigationintotheoriginsofthecovertvirusinthecityofWuhan, visitingananimaldiseasecontrolcenteronTuesday, indicatingthey'relookingintothepossibilitythevirusmadethejumpfromanimalstohumans.