It is a good thing they are telling people to call the hotlines instead of going to the hospital, but someone should do a follow-up to test people at home (on a triage or a random sampling basis). They can't just wait for things to burst open. The available drugs (Remdesivir is not widely available) are non-specific and likely only effective at the onset. Hopefully it is still early and most callers just have flu or cold.

In Japan, it works a bit differently. People who have a cold go to the local clinic. If the clinic is worried, then they send the patient to the hospital. It's also pretty normal to go to the clinic even if your symptoms aren't severe -- just for a cold. I suspect the "stay at home for 4 days" is meant to stop people from congregating at the clinic.

Ideally however you deliver a mask to them before they very outside their home so they don't infect taxi drivers, bus drivers, uber drivers and other passengers.

Only people driving to the clinic in their own car are less likely to infect their compatriots

I strongly suspect those cheap little surgical masks most people wear are close to useless, as they are incredibly porous and allow completely unfiltered air to get in through the sides of the mask.

A P100 or at least an N95 respirator would be far more effective, but most people aren't going to wear those, unfortunately.

They're meant to prevent already sick people from spreading particulate when they cough or sneeze.