Rumors of a cover-up by the Chinese government in the early days of the coronavirus is causing speculation about China's responsibility in the whole sordid mess. Most of the time, countries like China have sovereign immunity, and governments cannot be taken to court or even held liable regardless of their handling of situations, also when their poor choices affect other nations, as well as their own country.
However, some people are saying that because China's decision to keep silent about the coronavirus led to a domino effect and put the health of other nations in jeopardy, this is grounds for them to be held legally liable.
If a private party such as a hospital or healthcare worker of a chemical company had learned of a potentially lethal and highly contagious disease, and then purposely concealed it from the public, they would inevitably face criminal charges.