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If you test negative for COVID-19 using a PCR test, you are likely not infected, provided you do not have any symptoms.

  • Her work hinges on killing the virus while preserving the shape of its proteins.

  • This concept helps explain why you might have heard a lot of medical professionals advocate for frequent and widespread COVID-19 testing.

Often, the results of will be accepted to show negative COVID-19 status for shorter periods of time, such as 24 hours, and more comprehensive PCR polymerase chain reaction tests—which take longer to process—last for 48 to 72 hours as proof of your COVID-free status.

  • Accuracy during the first week of symptoms versus the second Rapid tests more accurately provided a positive COVID-19 result when administered during the first week of symptoms.

  • Most people who caught coronavirus will test positive six days after exposure, and nearly everyone who's infected will test positive within 14 days of exposure.