Picture of Strep Throat
Strep infection often produces a distinct pattern of white patches in the throat and on the tonsils, as well as red swollen tonsils. Strep throat is treated using antibiotics, which kill the bacteria causing the infection.
Anatomy of a Sore Throat
Image Source: Scott Camazine / Phototake
Text: "Anatomy of a Sore Throat", WebMD Slideshow