How do we know that Person B was infected by Person A, unless Person B went into quarantine directly after interacting with Person A? If they don’t go into quarantine, how do we know that a random Person C didn’t interact with them and cause the infection?
And for the vast majority of infections that can’t be contact traced like the example above, how do we determine the date they were actually infected if the disease can be transmitted asymptomatically?
In: Biology
Because of contact tracing.
If they can determine who you got it from, and when you encountered that person, they just count the days until your symptoms started. Earlier on when there are fewer cases, it’s easier to do this. Do it for enough people and you can get a decent average.
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