Pharyngoconjuctival fever is caused by:
**Core Concept**
Pharyngoconjunctival fever (PCF) is a contagious illness characterized by symptoms of upper respiratory tract infection, conjunctivitis, and fever. It is primarily caused by an adenoviral infection.
**Why the Correct Answer is Right**
Pharyngoconjunctival fever is caused by adenovirus serotypes 3, 4, and 7, which are highly contagious and spread through respiratory droplets or direct contact with contaminated surfaces. The virus infects the epithelial cells of the conjunctiva, pharynx, and other mucous membranes, leading to inflammation and symptoms of conjunctivitis, sore throat, and fever.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because adenovirus, not influenza virus, is the primary cause of pharyngoconjunctival fever.
**Option B:** This option is incorrect because rhinovirus, not rhinovirus, is not typically associated with pharyngoconjunctival fever.
**Option C:** This option is incorrect because enterovirus, not enterovirus, is not typically associated with pharyngoconjunctival fever.
**Clinical Pearl / High-Yield Fact**
Adenoviral infections are highly contagious and can be spread through contaminated surfaces, making proper hand hygiene and surface disinfection crucial in preventing the spread of PCF.
**Correct Answer: C. Adenovirus.**