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Aetiological Agents in Neonatal Nosocomial Sepsis and their Sensitivity Pattern from a Tertiary Care Hospital, Odisha, India: A Cross-sectional Study

Introduction: Nosocomial infections are a major problem for hospitalised neonates due to increase in morbidity, mortality, duration of hospitalisation and costs of treatment. The magnitude of this problem varies from place to place and is unique to each place as per the organisms and their resistance pattern is concerned. There is need to develop local level surveillance data on incidence of nosocomial sepsis, causative organisms, their sensitivity pattern and periodically review antibiotic policy based on this information. Aim: To determine the aetiological agents of nosocomial sepsis and their antibiotic sensitivity and resistance pattern. Materials and Methods: This was a cross-sectional study in which the cases of nosocomial infections in neonates of > 35 weeks were studied from November 2018-October 2019 at Sriram Chandra Bhanja Medical College and Hospital (S.C.B.M.C.H) and Sardar Vallabh Bhai Patel Postgraduate Institute of Paediatrics (S.V.P.P.G.I.P) based on clinical findings, sepsis screen and blood culture. Blood culture is considered as gold standard for diagnosis of sepsis. Blood sample (1 mL) was collected under strict asepsis in Becton Dickinson and Company (BACTEC) and was sent for performing blood culture. The data was processed and arranged into distribution tables and cross tables using Statistical Package for the Social Sciences (SPSS) version 21.0. Results: Out of total 100 suspected cases of nosocomial sepsis, blood culture was positive in 46 (46%) of cases. Candida spp. was the most common obtained organism 9 (19.5%) followed by Klebsiella pneumoniae 8 (17.3%) and Staphylococcus aureus 8 (17.3%) each respectively. There was increased incidence of bacterial resistance to commonly used antibiotics and combinations of it, like ampicillin, gentamicin, cefotaxime, amikacin and piperacillin+ tazobactam among these bacterial isolates. Among the possible new combinations deduced from the observation, the combination of vancomycin+amikacin had sensitivity of 67.6% and can be considered as initial antibiotic combination of choice while combination with colistin and tigecycline should be reserved only for culture proven resistant cases or babies who continue to be deteriorating and critically sick while on previous combination. Conclusion: Candida spp. is the leading cause of nosocomial sepsis. Among bacterial organisms, Klebsiella pneumoniae and Staphylococcus aureus are most common. Most isolates are resistant to traditional antibiotics, hence new combination like vancomycin+amikacin are more appropriate empiric choice in present context and combination with colistin and tigecycline are reserved only for culture proven resistant sepsis.