What is a likely cause of bilateral mucopurulent eye discharge in a 6-day-old infant?

Bilateral mucopurulent eye discharge in a 6-day-old infant is most commonly associated with chlamydia. Chlamydial conjunctivitis can occur in newborns if they are exposed to Chlamydia trachomatis during delivery, particularly if the mother is infected. This type of conjunctivitis typically presents between the fifth and twelfth day of life, making the timing consistent with the infant being 6 days old.

Chlamydia in the mother can lead to the infant developing conjunctivitis, characterized by the presence of discharge. The mucopurulent nature of the discharge indicates a bacterial infection, which aligns with the effects of a chlamydial infection.

In contrast, while group B Streptococcus (GBS), Cesarean delivery, and hepatitis B virus (HBsAg) status of the mother can contribute to various neonatal complications, they are not commonly linked with the specific presentation of bilateral mucopurulent eye discharge.