It is true that on April 28, Worldometer’s data had ranked Spain fifth when it came to total testing volume. At the time, OWID data also ranked Spain fifth, but as more countries began reporting larger testing volumes, it became clear how Worldometer’s data is flawed. Its Spain figure includes both polymerase chain reaction (PCR) tests, which show if patients are currently infected, and antibody tests, which indicate if patients were ever infected. For most countries besides Spain, Worldometer’s data appears to only count PCR tests.