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Could COVID screening tests possibly be inaccurate?

Yes, it is possible for someone to have COVID-19 and not pass it on to other members of their household, even if no precautions were taken. This can happen even if one member of the household is vaccinated. Testing for COVID-19 may not always be 100% accurate, but multiple tests can help decrease the chances of receiving a false negative result. If all tests come back negative, it is likely that the virus was not spread within the household.