There is a useful daily updated dashboard that tracks all the cases, recoveries, death, geographical data and analytics about all that:
1. They follow a quadratic distribution over time with a regression coefficient of >.99. that's now how epidemics spread
2. China ran out of testing kits weeks ago.
3. Half of the population is on lockdown, and according to Chinese reports, even those who are sick and need to go to the hospital are not allowed to travel. So cases are not being counted
4. Even if they were able to do so, hospitals have been overwhelmed for weeks and have been turning cases away
In addition to other reasons, the authoritarian CCP has shown a willingness to punish anyone who speaks toward how severe this infection actually is and their numbers absolutely cannot be trusted. Just look at the unprecedented response - 700 million people, 10% of the world's population, is under lockdown.
Specifically, it notes that "Sub-exponential growth profiles may result from heterogeneity in contact structures or risk groups, reactive behavior changes, or the early onset of interventions strategies, and consideration of "deceleration parameters" may be useful to refine existing mathematical transmission models and improve disease forecasts."
Not sure if there are more striking examples of "reactionary behavior change" than a massive lockdown.
The natural and societal circumstances surrounding this epidemic feel like a perfect storm.