People with no symptoms or minor symptoms don’t show up for testing.

The overall strategy is to delay the onset of new serious cases so hospitals are not overwhelmed and effective medicines (some are in use overseas already) can be made and distributed here in quantity. The government and drug company are trying to speed the medicines along. All population groups, including us, need to realize the threat and react quickly to public warnings. In Mitzrayim, there was a time HaShem told Yidden to stay indoors at home, no matter what.