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Failure of erythromycin ointment for postnatal ocular prophylaxis of chlamydial conjunctivitis
C Black-Payne1, J A Bocchini, C Cedotal
1Department of Pediatrics, Louisiana State University School of Medicine, Shreveport 71130.
Insights
Newborns in the US are frequently diagnosed with Chlamydia trachomatis conjunctivitis. Despite erythromycin eye ointment, a significant number of infants develop this infection, indicating prophylaxis failure.
Area of Science:
- Ophthalmology
- Neonatal Care
- Infectious Diseases
Background:
- Chlamydia trachomatis is a leading cause of conjunctivitis in infants in the United States.
- Ocular prophylaxis with erythromycin is standard for preventing neonatal conjunctivitis.
Purpose of the Study:
- To evaluate the incidence of Chlamydia trachomatis conjunctivitis in newborns.
- To determine the failure rate of erythromycin ocular prophylaxis.
Main Methods:
- Retrospective analysis of conjunctival specimens from infants born over 13 months.
- Calculation of infection rates and prophylaxis failure based on maternal colonization data.
- Case-control study to identify risk factors for chlamydial conjunctivitis.
Main Results:
- Chlamydial antigen was detected in 0.9% of live births (14% of tested infants).
- Estimated minimal failure rate for erythromycin prophylaxis ranged from 7% to 19.5%.
- Maternal primiparity and prolonged rupture of membranes were associated with increased risk.
Conclusions:
- A significant proportion of infants develop Chlamydia trachomatis conjunctivitis despite erythromycin prophylaxis.
- Current prophylaxis may be insufficient for preventing Chlamydia trachomatis neonatal conjunctivitis.
- Further research into alternative or enhanced preventive strategies is warranted.
Abstract:
Chlamydia trachomatis is the most common pathogen associated with conjunctivitis during early infancy in the United States. During a 13-month interval at our medical center 4834 infants were born, 311 of whom (6.4%) had conjunctival specimens tested for chlamydial antigen before the age of 12 weeks. In 44 (14% of all tested infants, 0.9% of live births) chlamydial antigen was present. Because the rate of asymptomatic maternal chlamydial endocervical colonization is estimated to be 26% at our institution (previous prospective study), we calculated a minimal failure rate for erythromycin ocular prophylaxis of from 7 to 19.5%. A subsequent case-control study revealed that mothers of infants with chlamydial conjunctivitis were more likely to be primiparous (P = 0.03) and experience longer duration of rupture of membranes before delivery (P = 0.046). We conclude that a substantial percentage of infants exposed to Chlamydia develop chlamydial conjunctivitis despite receiving erythromycin ocular prophylaxis.