What condition describes conjunctivitis in an infant under 30 days of age acquired during delivery?

The condition that describes conjunctivitis in an infant under 30 days of age acquired during delivery is ophthalmia neonatorum. This term specifically refers to the conjunctivitis that occurs in newborns due to exposure to infectious agents during the birthing process, often as a result of maternal infections such as gonorrhea or chlamydia.

Ophthalmia neonatorum signifies a serious infection that can lead to complications if not treated promptly, highlighting the importance of eye prophylaxis in newborn care. The condition typically presents within the first 30 days of life, making it vital for healthcare providers to recognize and manage it aggressively to prevent potential vision loss or other significant health issues.

Other types of conjunctivitis, such as viral or allergic conjunctivitis, are less likely to manifest in the immediate neonatal period and are more common in older children and adults. Chlamydial conjunctivitis is a specific type that can fall under the broader category of ophthalmia neonatorum if it occurs due to a chlamydia infection acquired during delivery, but the term 'ophthalmia neonatorum' encompasses any conjunctivitis in newborns from various causes.