Variables
Variables of interest included demographic (age, sex, race, ethnicity), clinical (immunocompromising condition, chemotherapy phase, test indication and location), laboratory data (absolute neutrophil count [ANC], absolute lymphocyte count [ALC] within 72 hours of initial test), microbiologic data (sources, dates and results of SARS -CoV-2 testing) and immunocompromising medication (name, class, therapy phase). We defined low ANC or ALC as a level <1000 cells/uL, and moderately low ANC or ALC as a level of 1000-1500 cells/uL.