Antibody testing for COVID-19 appears critical as the Illinois Department of Public Health announced another 1,173 new cases of the coronavirus on April 13 and 74 more deaths.
More than 28,000 Cook County residents contracted strains of influenza during the 2017-2018 flu season, far more than the 4,767 confirmed cases of COVID-19 reported here so far. Skeptics may point out the coronavirus might only have reached Cook County by January.