**Question:** Apollo conjunctivitis is caused by

A. Staphylococcus aureus
B. Streptococcus pneumoniae
C. Haemophilus influenzae
D. Neisseria meningitidis

**Core Concept:** Apollo conjunctivitis is a clinical syndrome characterized by bilateral, symmetric conjunctivitis, usually occurring in children, with a seasonal pattern during the summer solstice. It is named after the Greek god Apollo, who is associated with the sun.

**Why the Correct Answer is Right:** Apollo conjunctivitis is primarily caused by viruses, particularly the enteroviruses (specifically, Coxsackievirus A24 variant) that are transmitted via respiratory droplets or close contact. While the bacteria mentioned in options A, B, and D are also common causes of bacterial conjunctivitis, they are not directly associated with the seasonal pattern of Apollo conjunctivitis.

**Why Each Wrong Option is Incorrect:**

A. Staphylococcus aureus and Streptococcus pneumoniae are commonly associated with bacterial conjunctivitis and do not exhibit the seasonal pattern observed in Apollo conjunctivitis.

B. Streptococcus pneumoniae is a bacterium causing bacterial conjunctivitis, not a virus.

C. Haemophilus influenzae is a common bacterium causing bacterial conjunctivitis, not a virus.

D. Neisseria meningitidis is a bacterium causing meningitis, not conjunctivitis.

**Clinical Pearl:** Understanding the cause of Apollo conjunctivitis is crucial to differentiate it from other forms of conjunctivitis, particularly viral conjunctivitis, which may be confused due to similar symptoms. This distinction is important for appropriate diagnosis, treatment, and prevention measures.