In a new study published Wednesday, CDC researchers said more than a quarter of counties with large Asian or Black populations reported a high Covid-19 incidence rate in the first two weeks of April last year. … At the time, about 11.4% of all counties had a high Covid-19 incidence rate, compared with nearly 29% of counties with an above-average share of Asian residents and nearly 28% of counties with an above-average share of Black residents, the study indicates.