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Isolation and Epidemiology of Respiratory Bacteria From Unusual Sites: Demographic, Seasonal, and Geographic Distribution in a Laboratory-Based Study From a Tertiary Care Hospital in Karachi, Pakistan

Zehra SR, Khan SM, Mehmood S, Farooqi J, Jabeen K

Cureus, 2025

12 participants

Abstract

Introduction Respiratory pathogens such as Streptococcus pneumoniae, Haemophilus influenzae, and Haemophilus parainfluenzae primarily infect respiratory and oropharyngeal sites. However, they are increasingly being isolated from unusual anatomic sites, such as urogenital and abdominal sources. These atypical occurrences necessitate an understanding of their epidemiology and clinical implications. Methods This study aimed to evaluate the seasonal prevalence, gender distribution, and clinical characteristics of Streptococcus pneumoniae, Haemophilus influenzae, and Haemophilus parainfluenzae isolated from nonrespiratory, unusual sites. Conducted at the Clinical Microbiology Laboratory of Aga Khan University Hospital in Karachi, Pakistan, the study included data from January 2021 to July 2023. Isolates from the urogenital tract, joints, skin and soft tissue, and other invasive samples from various body sites were included, while specimens from usual sites, such as blood, cerebrospinal fluid (CSF), and respiratory samples, were excluded. Analysis was performed after excluding isolates from unknown sources and duplicate samples from the same medical record number. A descriptive analysis was conducted on a small subset of inpatients with detailed clinical histories. Results Out of 2321 samples, 464 (20.0%) were excluded, and 1857 (80.0%) were analyzed, with 49 (2.6%) isolates from unusual sites. Isolation from unusual sites was significantly associated with female gender, the years…

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