| Reference | Setting | RR | Comments |
| Libshitz HI [22] | USA | 9.0 | Cancer patients (including HM) |
| de la Cámara [23] | Spain | 2.95 | Allogenic Stem Cell Transplantation |
| Kamboj M [24] | USA | 40 | Highest rate among Stem Cell Transplant Recipients |
| Mishra P [14] | India | 23 | Patients with acute leukemia. Highest rate in AML |
| Stefan DC [25] | South Africa | 22 | Children with LLA |
| Chen CY [26] | Taiwan | 2.05 |
|
| Wu CY [27] | Taiwan | 3.22* | Non-Hodgkin Lymphomas and Leukaemias |