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The tests used in this evaluation were designed to look for antibodies to SARS-CoV-2, the virus that causes COVID-19, rather than antibodies to other types of coronaviruses. However, there is some limited similarity between SARS-CoV-2 and other, more common coronaviruses, so cross reactivity cannot be completely ruled out. Nearly everyone over the age of five has had a common coronavirus infection and has antibodies against those viruses.