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Our results provide an improved understanding of how best to use viral and antibody tests for coronavirus, especially when not every person exposed to the virus will have a positive response, said Sanjeev Krishna, professor of molecular parasitology and medicine at St. Georges University of London, according to a university press release. We need to understand how best to interpret the results from these tests to control the spread of the virus, as well as identifying those who may be immune to the disease.