The most common pathogens in the survey on patients at Blood Transfusion and Hematology Hospital were Klebsiella pneumoniae (16.9%), Escherichia coli (16.9%), Pseudomonas aeruginosa (15.4%), Candida (10.8%), S aureus (9.2%), Staphylococcus epidermidis (7.7%), Stenotrophomonas maltophilia (4.6%) and other 18.5%.