Adenovirus

Pharyngoconjunctival fever is caused by serotypes 3, 4, 7, 11 of adenovirus. It is associated with keratitis in 30% cases. (3+4 =7, 7+4=11)

Epidemic keratoconjunctivitis is caused by serotypes 8, 9, 17, 37 of adenovirus. It is associated with keratitis in 80% cases. (E= Eight, 8+9 = 17)