question archive COVID-19 is caused by infection with a novel (new) coronavirus, SARS-CoV-2
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COVID-19 is caused by infection with a novel (new) coronavirus, SARS-CoV-2. Home kits test for active infection by examining samples taken from the nasal mucosa for antigens of the virus. Another type of testing involves examining blood for the presence of antibodies that can bind to SARS-CoV-2. Use what you've learned about the immune system (including relevant vocabulary) to provide two reasons why someone might possess antibodies to SARS-CoV-2 in their blood.