I'm literally fighting local health department in telling them their data is shit. We have 3 counties that consist of around 80,000 people in this one health department. We have on average 10-20 people per day getting tested with a positivity rate of around 20%. HOW IN THE FUCK is that representative to the rest of the population?! It can't be! Help me fight these worthless, power hungry assholes!
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Annoy your boss until you can get a larger sample size.
Rough determinations for sample sizes proportional to population size:
Pop Size: 80,000
Required Sample Size: 2331
https://www.checkmarket.com/sample-size-calculator/
Edit: The calculator is for survey sample sizes but the theory still applies. If only sick people are walking in to get tested then you will have a greater (+) rate.