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Updated: Jul 24, 2026

Conjunctival Commensal Isolation and Identification in Mice
Published on: May 1, 2021
[Bacterial conjunctivitis: most prevalent pathogens and their antibiotic sensitivity]
B Orden Martínez1, R Martínez Ruiz, R Millán Pérez
1Servicio de Microbiología, Centro de Especialidades Argüelles, Hospital Universitario Puerta de Hierro, Madrid, Spain. monord@telefonica.net
This study identified Haemophilus influenzae and Streptococcus pneumoniae as the most common causes of bacterial conjunctivitis in children. Ciprofloxacin, chloramphenicol, and rifampin showed the most activity against these prevalent pathogens.
Area of Science:
- Ophthalmology
- Microbiology
- Pediatrics
Context:
- Bacterial conjunctivitis is common in children and often treated empirically with topical antibiotics.
- Identifying the causative agents and their antibiotic susceptibility is crucial for effective treatment.
- This study investigated the etiological agents of bacterial conjunctivitis in pediatric outpatients in Madrid.
Purpose:
- To determine the prevalence of bacterial pathogens causing conjunctivitis in children.
- To analyze the age-specific distribution of these pathogens.
- To assess the in vitro antibiotic susceptibility of the isolated bacteria.
Summary:
- A 3-year study of 596 pediatric conjunctival exudates identified Haemophilus influenzae (44.8%) and Streptococcus pneumoniae (30.6%) as the most prevalent bacteria.
- Staphylococcus aureus prevalence varied significantly by age group (p < 0.0001).
- Streptococcus pneumoniae exhibited the highest antibiotic resistance, while ciprofloxacin, chloramphenicol, and rifampin were active against the most common pathogens.
Impact:
- Provides essential data on the local epidemiology of bacterial conjunctivitis in pediatric populations.
- Informs empirical antibiotic selection for treating pediatric bacterial conjunctivitis.
- Highlights the need for ongoing surveillance of antibiotic resistance patterns.
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