According to Wikipedia, there is only one biosafety level 4 (the highest level) lab in China. And it’s in Wuhan, where the coronavirus outbreak started

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by Bas1l87

Essential features of a biosafety level 4 (BSL-4) laboratory[1]

So, there are four levels of biosafety security. Labs with the highest BSL-4 level study dangerous deadly viruses and diseases that are transmitted easily. According to Wikipedia, there are 70 labs with the highest level BSL-4 in the world and one of them is in China. Interestingly, it is located in Wuhan, the city where the recent coronavirus outbreak happened. To me, it looks quite suspicious given the outbreak, the ensuing blockade of Wuhan, the lack of information from the Chinese government at the beginning of the outbreak. Who knows what they were studying there?