There are people carrying the virus that are unaffected by it. That's the troubling thing. So I will just gamble online for a while 
I think it is called asymptomatic.
Those people without any symptoms of the virus but have the virus are asymptomatic and they are the ones with high immunity when it comes to those kinds of diseases. This is a problem to health workers as they can't really identify these people but there are also some that say these asymptomatics are also affected by the virus like losing their sense of smell. This is the reason why we should not get out that easily or normally or even think of gambling in a casino since our enemy has no face and unseen while killing many people globally.
That's 100% correct and true, we cannot see our enemy, so going out in a crowded places is just like exposing ourselves on the virus.
Therefore, there's no way a casino would resume their operation if the vaccine is not release yet, otherwise, we will all suffer in the end, the only time to gamble if after this outbreak but that has been a question until now since we have no idea when this will end.