Increasing bacterial resistance in pediatric acute conjunctivitis (1997-1998)

Area of Science:

• Ophthalmology
• Microbiology
• Pediatrics

Background:

• Pediatric conjunctivitis is a common condition.
• Haemophilus influenzae and Streptococcus pneumoniae are primary causative pathogens.
• Understanding antimicrobial resistance patterns is crucial for effective treatment.

Purpose of the Study:

• To determine the current antimicrobial resistance levels of H. influenzae and S. pneumoniae in pediatric conjunctivitis.
• To assess the prevalence of beta-lactamase production in H. influenzae.
• To evaluate the penicillin susceptibility of S. pneumoniae isolates.

Main Methods:

• Prospective culture of acute conjunctivitis cases in 250 pediatric patients (January 1997-March 1998).
• Isolation and identification of bacterial pathogens.
• Antimicrobial susceptibility testing, including beta-lactamase detection and penicillin susceptibility testing.

Main Results:

• H. influenzae (42%) and S. pneumoniae (30%) were the most common pathogens.
• 69% of H. influenzae strains produced beta-lactamase.
• 32% of S. pneumoniae isolates were non-susceptible to penicillin (26% resistant, 6% intermediate).
• H. influenzae was frequently associated with conjunctivitis-otitis syndrome (57% of cases).
• Ciprofloxacin, ofloxacin, and tetracycline showed the highest in vitro activity.

Conclusions:

• H. influenzae remains a primary pathogen in pediatric conjunctivitis, with high rates of beta-lactamase production.
• A significant proportion of S. pneumoniae isolates exhibit penicillin non-susceptibility.
• Antimicrobial resistance patterns necessitate careful selection of treatments for pediatric conjunctivitis.