A prospective epidemiological study conducted in pediatric hematology oncology center in Hadassah medical center. The study will include all newly diagnosed pediatric cancer patients age 0-18 years admitted with fever during chemotherapy.

In each event of febrile episode during chemotherapy, the following data will be collected using a patient data form and computerized software.

Demographic data: age, gender, ethnicity. Clinical data: Underlying disease, immunizations, prophylactic antibiotics, presence of central venous catheter, intensity of chemotherapy, duration of fever, duration and severity of neutropenia, diagnosis of present event.

Imaging data Microbiological data Outcome The statistical analysis will be performed by an epidemiologist and statistician using the SPSS 12.0 software.

Inclusion Criteria:

• Pediatric cancer patients age 0-18 years admitted with fever during or following chemotherapy

Exclusion Criteria:

• No exclusions

All newly diagnosed pediatric cancer patients age 0-18 years admitted with fever during or following chemotherapy