Different government track the numbers differently. While I do believe Chinese government uses the best way to make it looks good on them, but I don't think the 'actual number' will be drastically different. Because if they do, then it's releasing false signal to citizen, which could cause a second wave of infection. There is a very aggressive surveillance method in place, which I doubt is acceptable by other countries: https://www.nytimes.com/2020/03/01/business/china-coronaviru...