Streptococcus pyogenes is a type of bacteria that belongs to the group of bacteria known as streptococci. It is a gram-positive bacterium, meaning it has a thick cell wall that retains a purple stain during laboratory testing. This bacterium is responsible for various infections, including strep throat, skin infections, and more severe conditions like rheumatic fever and necrotizing fasciitis. Streptococcus pyogenes is commonly spread through respiratory droplets or direct contact with infected wounds. Symptoms of infections can vary but often include sore throat, fever, and redness or swelling in affected areas. Treatment typically involves antibiotics, which can effectively eliminate the bacteria and reduce the risk of complications.