I guess all bio should be closed. But if accident happened you should inform the people to prevent the disease.
In Jan/Feb, it took at least a week or two to confirm a covid-19 case from typical pneumonia without the standard nasal swab test. Doctor must be a good detective and patiently rule out all possible known infections one by one from lab tests or failed treatment.
Five cases reported in mid Jan. One severe case in California was treated successfully with Gilead's Remdesivir. From doctor's point of view, it is very hard to spot a covid-19 case at that time.
depends, who is 'they' specifically? by name, address, ... you get the idea. who you gonna call to demand they 'pay' proper trials would seem like a good place to start in assigning guilt, no? https://en.wikipedia.org/wiki/Biological_Weapons_Anti-Terrorism_Act_of_1989