Final answer:
Strep throat is an infection of the pharynx characterized by symptoms such as fever, pharyngeal pain, and swollen tonsils with pus patches. It is caused by Streptococcus pyogenes.
Step-by-step explanation:
The infection of the pharynx that is normally called sore throat and is characterized by erythematous and swollen tissue, as well as inflammatory exudates, vesicles, and mucosal ulceration or nasopharyngeal lymphoid hyperplasia, is known as Strep throat. Strep throat is caused by Streptococcus pyogenes, a gram-positive bacterium. It presents with symptoms such as fever, intense pharyngeal pain, swollen tonsils with pus patches, and petechiae on the palate.