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Usefulness of Low Risk Criteria for Serious Bacterial Infection Among Febrile Infants Younger than Three Months of Age  

Kim, So Hyun (Department of Pediatrics, College of Medicine, Ewha Womans University)
Jung, Ji Ah (Department of Pediatrics, Pundang Jesaeng General Hospital Daejin Medical Center)
Kim, Hae-Soon (Department of Pediatrics, College of Medicine, Ewha Womans University)
Yoo, Eun Sun (Department of Pediatrics, College of Medicine, Ewha Womans University)
Sohn, Sejung (Department of Pediatrics, College of Medicine, Ewha Womans University)
Seo, Jeong Wan (Department of Pediatrics, College of Medicine, Ewha Womans University)
Lee, Seung Joo (Department of Pediatrics, College of Medicine, Ewha Womans University)
Publication Information
Clinical and Experimental Pediatrics / v.45, no.8, 2002 , pp. 967-972 More about this Journal
Abstract
Purpose : A retrospective study was undertaken to evaluate the usefulness of low risk criteria for identifying febrile infants younger than three months unlikely to have serious bacterial infection. Methods : We conducted a retrospective study of 527 infants younger than three month with a axillary temperature ${\geq}37.4^{\circ}C$. If they met the following all four criteria, appear well, WBC $5,000-20,000/mm^3$, urine stick WBC(-) and nitrite(-), CSF WBC < $10/mm^3$, they were considered at low risk for serious bacterial infection(SBI). SBI was defined as a positive culture of urine, blood, or cerebrospinal fluid. The sensitivity, specificity, negative predictive value and positive predictive value of the low risk criteria were calculated. Results : Of 527 febrile infants, 110(21.0%) had serious bacterial infections. The 2.7% who met the low risk criteria had SBI and negative predictive value was 97.3%. SBI was diagnosed in 103 infants(38.6%) who didn't meet the low risk criteria including urinary tract infection(78.6%), most commonly, bacteremia(16.5%), bacterial meningitis(8.7%), Salmonella gastroenteritis(1%), osteomyelitis( 1%), septic arthritis of hip joint(1%). There were no differences in the sensitivity and negative predictive value according to the monthly-age-group. Conclusion : This low risk criteria to identify infants unlikely to have SBI early is available, however low risk infants must be carefully observed.
Keywords
Fever without source; Febrile infant; Bacteremia; Low risk criteria; Predictive; Serious bacterial infection;
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