Either one. If you're suspected, that means you were exposed, so we are assuming you have it, just to err on the side of caution even though they might not be infected.
For example, all you need is one person who's infected, but not showing symptoms to visit 2 shuls, 1 school, 1 restaurant and 4 stores, to exponentially spread a virus, that would otherwise probably die out in 5 - 6 days, or up to 14 days.