Interesting, from the link Roger provided above:
At the present time, it is not expected that the Chinese delegation should undergo a mandatory quarantine, but the situation changes by the hour, and each territory applies different measures. To be on the safe side, we are studying the possibility of offering the Chinese delegation to occupy a country house in the Moscow region upon arrival, with medical assistance at their disposal. This observation period will ensure that they will be able to continue their trip to Yekaterinburg without any issues, even if the security measures in the Sverdlovsk region are tightened in the forthcoming days.
I don't think that the situation will worsen sufficiently in one month that other countries will similarly be affected (though Japan is close enough and the location of a cluster of cases on that cruise ship that Wang Hao would probably be advised to travel sooner rather than later).
If things really get worse, the nationality of the Challenger for later in the year might be relevant (e.g. if Ding Liren or Wang Hao win the Candidates).