You need x amount of subjects that were confirmed positive. You then just track them. Seems simple to me but what do I know.
So only if they're asymptomatic can they get reinfected?
wouldn't the same hold true if for example one tested positive in the beginning of march, had all the symptoms, fully recovered and tested positive again, and once again has all the symptoms? Why haven't we seen or heard of at least a few hundred cases across the country?
P.s if they test positive and are asymptomatic and test positive once again, we would likely say it was a false positive.