how does waste water testing determine infection rates?

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What’s the process for learning the percentage of infection?

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Every sick person adds an amount of infection to water. Let’s say it’s 1 bacteria. So if 100,000 people poop, there’s 100,000 bacteria in the water. If there’s 200,000 people in the wastewater district, you know there’s a 50% infection rate because 100,000/200,000 is .5