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Fatal group B streptococcal pneumonia in neonates. Effects of antibiotics
Abstract:
Prophylactic penicillin has been suggested to prevent neonatal group B streptococcal infections (GBS). However, there is a concern that the antibiotics may conceal significant bacteremia if post-treatment blood cultures were used to recover the etiologic agent. To clarify this point, the autopsy records of 111 cases of fatal neonatal pneumonias is infants less than one week of age for the period 1974-1978 were reviewed. Nineteen documented cases of group B streptococcal infections were uncovered. Review of antibiotic therapy in these infants indicate that such therapy can indeed conceal the etiologic agent of pneumonia if one uses post treatment blood (or other normally sterile body fluids) cultures as the basis of diagnosis. On the other hand, review of 41 cases with morphologic evidence of pneumonia and no identifiable etiologic agent reveal that the majority of these were referral cases from outlying hospitals who received antibiotics prior to any diagnostic work-up.
Insights
Prophylactic penicillin may mask group B streptococcal (GBS) infections in newborns. Antibiotic use can hinder accurate diagnosis via blood cultures, impacting treatment strategies for neonatal pneumonia.
Area of Science:
- Neonatal Medicine
- Infectious Diseases
- Pathology
Background:
- Prophylactic penicillin is used to prevent neonatal group B streptococcal (GBS) infections.
- Concerns exist that antibiotics may mask bacteremia, complicating diagnosis with post-treatment cultures.
Purpose of the Study:
- To investigate the impact of antibiotic therapy on the detection of group B streptococcal (GBS) neonatal infections.
- To clarify if antibiotic use can conceal the etiologic agent in neonatal pneumonia cases.
Main Methods:
- Retrospective review of autopsy records for 111 infants (<1 week old) with fatal neonatal pneumonia (1974-1978).
- Analysis of antibiotic therapy in infants with confirmed GBS infections.
- Examination of cases with morphologic pneumonia but no identified etiologic agent, focusing on prior antibiotic exposure.
Main Results:
- Nineteen cases of neonatal group B streptococcal (GBS) infections were identified.
- Antibiotic therapy was found to conceal the etiologic agent in GBS pneumonia when relying on post-treatment blood cultures.
- A majority of pneumonia cases without an identified agent involved infants referred from other hospitals who had received prior antibiotics.
Conclusions:
- Antibiotic administration prior to diagnostic work-up can mask the causative agent in neonatal pneumonia, particularly GBS infections.
- Reliance on post-treatment blood cultures may lead to underdiagnosis of GBS in neonates receiving prophylactic antibiotics.
- Careful consideration of antibiotic history is crucial for accurate diagnosis of neonatal infections.