In both the rapid test and PCR test, samples are collected using a nasal swab. If your test result is negative, test again 5 to 7 days after your last exposure, or immediately if symptoms develop. If you are not fully vaccinated, test immediately if you find out you are a close contact. When should the rapid COVID-19 test be used?ĬOVID-19 rapid antigen self-tests are intended for the detection of the virus That leads to delays in decreasing the spread of the virus. When the demand for testing is high, PCR results can take a week or longer. They are often more accurate than rapid tests, especially for people without symptoms.
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