Testing positive for COVID-19 may be due to past or present infections with a common cold coronavirus
“False positive results for IgM and IgG antibodies may occur due to cross reactivity from pre-existing antibodies or other possible causes.” “Positive results may be due to past or present infection with non-SARS-CoV-2 coronavirus strains, such as coronavirus HKU1, NL63, OC43, or 229E” “Results from antibody testing should not be used to diagnose or exclude […]