What organ is affected by strep throat?

Strep throat primarily affects the throat and tonsils. Strep throat is a bacterial infection of the throat and tonsils, medically known as pharyngitis and tonsillitis respectively, caused by the Streptococcus pyogenes bacteria. Symptoms include throat pain, fever, difficulty swallowing, swollen lymph nodes, and inflamed tonsils. Treatment usually involves antibiotics, pain relievers, and rest.