Rist factors a Opportunistic pathogen majority of infections occurring in patients with immunosuppressive conditions a Risk facters: lymphoma, other malignancies, HIV, HSCT, solid organ transplant(soT), steroids or other medications that suppress cell-mediated immunity a Nocardia infection among SoT: 0.6% to 3%. Lung transplant recipients have the highest incidence followed by recipients of heart, small bowel, kidney, and liver transplants Clin Infect Dis. 2007; 44(10)Rist factors p Opportunistic pathogen: majority of infections occurring in patients with immunosuppressive conditions p Risk facters: lymphoma, other malignancies, HIV, HSCT, solid organ transplant(SOT), steroids or other medications that suppress cell-mediated immunity. p Nocardia infection among SOT: 0.6% to 3%. Lung transplant recipients have the highest incidence, followed by recipients of heart, small bowel, kidney, and liver transplants. Clin Infect Dis. 2007;44(10)