Background: Late Neonatal Bacterial Infection (LNNBI) is a clinical and biological manifestations related to penetration and growth of specific causative bacteria in bloodstream occurring on the 4th-28th day of life. LNNBI still represents an important cause of mortality and morbidity among infants. Objectives: To determine the frequency of late bacterial infections in newborns, to describe the clinical and biological profiles and to identify the main responsible germs. Methods: Descriptive study data collection, conducted over a period of 10 months at the Brazzaville Teaching Hospital, of interest to newborns admitted from the 4th day of life for suspicion of neonatal infection, and those admitted for any other pathology and having presented an infection 48 hours after hospitalization, and in whom a bacterial culture and/or an inflammatory assessment confirmed or suspected infection. Results: During the study period, 1682 newborns were hospitalized, and 86 were hospitalized for a late neonatal bacterial infection, i.e. a frequency of 5.1%. There were 67 (77.9%) community infections and 19 (22.1%) nosocomial infections. The frequency of nosocomial infection was 1.1%. The main signs were fever in 65 cases (75.6%), and respiratory distress in 37 cases (43%). The most frequent localizations were bacteremia 32 (37.2%), pulmonary 21 (24.4%), digestive and meningeal in 11 cases (12.8%) each. The most common germ Klebsiella in 10 (50%) newborns was resistant to the usual antibiotics. The evolution was favorable in 71 cases (82.5%), and death occurred in 12 cases (14%). Conclusion: Late neonatal bacterial infection is common. The main responsible germs are gram-negative bacilli, in particular Klebsiella multi-resistant.
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