| Summary: | 155 children and adolescents who had been diagnosed oncohematological diseases and had undergone allogeneic hemapoetic stem cell transplantation were examined. In post-transplant period 80% of patients developed different bacterial complications. Main risk factors of bacterial infections were acute leukemia (73%), acute «graft versus host disease» (61%), severe infectious complications before HSCT (30%), cytomegaloviral reactivation (51%). Main causative agents were Kl. pneumoniae (15%), Escherichia coli (8%), Enterobacter sp. (7%), Pseudomonas sp. (6,5%), Enterococcus sp. (16,5%), S.еpidermidis (13,5%). Most frequent involved sites are urinary tract (30,6%), lungs (22,5%) and bacteriemia (38,7%). Rise in ciprofloxacin resistans among Entorobactri, aerobic and Gram-positive cocci. General survival rate of patients with bacterial complications was 36,3% (p<0,001). Number of infectious episodes and their severity were statistically significant (both p<0,001) deteriorating factor for general surviral rate.
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