Not all COVID-19 tests work the same way, but it's more than just if they are 'good or bad.' Here are some answers to your questions about testing:
Here's where things get a bit tricky. Generally, PCR tests tend to be more reliable.
"If you're using a highly sensitive test in a diagnostic setting," he said, "you don't need follow up. If you use it in a screening setting, you should have confirmation." For PCR tests, the same sensitivity that contributes to its accuracy can create false positives. A bit of viral RNA from a previous patient can turn a test positive.
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