Related Experiment Videos
Microbial causes of neonatal conjunctivitis
Abstract:
We assessed the microbial causes of neonatal conjunctivitis by comparing 55 infants with purulent conjunctivitis and 60 healthy control infants. A mean of greater than 5 leukocytes per 1000X microscopic field was seen in Gram-stained smears obtained from the more inflamed eye in 77% of 30 untreated patients but none of 57 controls. Pathogens isolated more often from untreated patients than from controls included Haemophilus spp. (17% vs 2%, P = 0.01), Staphylococcus aureus (17% vs 2%, P = 0.01), Chlamydia trachomatis (14% vs 0%, P = 0.01), enterococci (8% vs 0%, P = 0.05), and Streptococcus pneumoniae (11% vs 2%, P = 0.06). One or more of these pathogens were isolated from the conjunctivae in 58% of patients and 5% of controls (P less than 0.001). Bacterial morphology seen on smear correlated with the pathogens cultured. Isolation of Haemophilus spp. or S. pneumoniae was associated with dacryostenosis. We conclude that several microbial pathogens are implicated in neonatal conjunctivitis. These organisms have differing susceptibilities to antimicrobial agents, so culture and sensitivity testing are required as a guide to therapy.
Insights
Neonatal conjunctivitis is often caused by multiple microbial pathogens, including Haemophilus, Staphylococcus aureus, and Chlamydia trachomatis. Prompt identification through culture and sensitivity testing is crucial for effective antimicrobial therapy.
Area of Science:
- Ophthalmology
- Microbiology
- Neonatal Care
Background:
- Neonatal conjunctivitis is a common condition in newborns.
- Identifying the specific microbial causes is essential for appropriate treatment.
Purpose of the Study:
- To investigate the microbial etiology of neonatal conjunctivitis.
- To compare the prevalence of pathogens in infants with and without conjunctivitis.
Main Methods:
- Compared Gram-stained smears and cultures from 55 infants with purulent conjunctivitis and 60 healthy controls.
- Identified pathogens including Haemophilus spp., Staphylococcus aureus, Chlamydia trachomatis, enterococci, and Streptococcus pneumoniae.
Main Results:
- Leukocytes were significantly higher in patients with conjunctivitis.
- Specific pathogens were isolated more frequently in affected infants (58% vs 5%).
- Haemophilus spp. and Streptococcus pneumoniae were associated with dacryostenosis.
Conclusions:
- Multiple microbial pathogens contribute to neonatal conjunctivitis.
- Culture and sensitivity testing are vital due to varying antimicrobial susceptibilities.
- Tailored therapy based on microbial identification improves treatment outcomes.