What is the most common pathogen causing sore throat, swollen glands, and exudative pharyngitis in an 18-year-old?

The most common pathogen responsible for causing sore throat, swollen glands, and exudative pharyngitis in an 18-year-old is Streptococcus pyogenes, also known as Group A Streptococcus. This bacterium is a prevalent cause of streptococcal pharyngitis, particularly in adolescents and young adults.

Symptoms associated with infections caused by Streptococcus pyogenes typically include a sudden onset of sore throat, fever, and the presence of exudate (white or yellow patches) on the tonsils or pharynx. Additionally, this pathogen can lead to swollen lymph nodes (glands), creating discomfort and pain.

While infectious mononucleosis, often caused by the Epstein-Barr virus, can also present with similar symptoms such as sore throat and swollen glands, it is less common than streptococcal infections in this age group. Other pathogens mentioned, like Streptococcus pneumoniae and Haemophilus influenzae, are more associated with respiratory infections such as pneumonia or otitis media, rather than the classic presentation of pharyngitis. Therefore, the key factors that affirm Streptococcus pyogenes as the correct answer include its commonality in adolescent pharyngitis and its characteristic