Streptococcal Pharyngitis, commonly known as strep throat, is an infection caused by the Streptococcus pyogenes bacteria. It primarily affects the throat and tonsils, leading to symptoms such as a sore throat, fever, and swollen lymph nodes. This condition is highly contagious and can spread through respiratory droplets from coughing or sneezing. Diagnosis typically involves a physical examination and a rapid strep test or throat culture. Treatment usually includes antibiotics to reduce symptoms and prevent complications. It's important to complete the full course of antibiotics to ensure the infection is fully cleared and to minimize the risk of spreading it to others.