The following variables will be followed: time and location of positive cultures, underlying diseases and severity of illness, recent immunomodulative therapies, physical exam findings, previous medical surgical conditions, microbiology and virology culture results, laboratory and radiographical data, antimicrobial usage of onset of infection, microbiological data and resistance patterns, choice of antibiotics once organism identified, suspected source of infection, bacteriological outcomes, laboratory results, demographic information, pathology and histology results, summaries of admissions, discharges, operations, death, medications, clinical outcome gender, height, weight, ethnicity, date of transplant, type of transplant, primary diagnosis, and past medical history. Also required are medical summaries of admissions, discharges, operations, and deaths
