CD40LG and chronic myelogenous leukemia, BCR-ABL1 positive: Eleven out of 564 patients had a positive IgG test and 3 of them were also IgM‐positive, for an estimated serological prevalence of SARS‐CoV‐2 infection in the CML population of 1.95% (95%CI 1.09–3.46), which was close to the national serological prevalence on the general population (Table 1).