(CNN) Health officials in at least three states have been combining Covid-19 data on diagnostic tests and antibody tests, skewing results and potentially giving a muddied picture of the virus's spread over time. The issue is just one of the ways that coronavirus testing data can mislead or obscure when not used consistently and appropriately. And in the US in recent days, Georgia and Florida have faced questions about the transparency of their coronavirus data reporting. The state's coronavirus dashboard did not yet reflect a distinction in antibody tests versus active virus tests. It's unclear how many of those positive cases are from antibody tests or active infection tests.

Source: CNN May 20, 2020 19:07 UTC