Confirmed cases of COVID-19 were defined by a positive reverse transcription polymerase chain reaction (RT-PCR) assay of a specimen collected on a nasopharyngeal swab.
The severity of COVID-19 at admission is graded according to the China Center for Disease Control and Prevention definitions (17 (link)).
Disease status at the time of SARS-CoV-2 detection was defined according to each specific disease’s revised criteria for leukemia, myeloproliferative neoplasm, multiple myeloma, and lymphoma. The ISI was calculated as previously described (4 (link)).
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