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Of the tests available for making a diagnosis of SARS-CoV-2 infection, for the majority of respondents in this sample, none were positive. 

A diagnosis was most commonly established by the history of illness and the physical examination.

Less than 1/4 had a positive serum antibody test and even less a positive quantitative polymerase chain reaction (qPCR) nasal swab. 

Oral swabs were positive in 10% and imaging or orther tests were also positive for approximately 10%.

All applied tests were positive in fewer than 3% of respondents.

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