Streptokokken are a type of bacteria that belong to the genus Streptococcus. They are spherical in shape and often form chains or pairs. These bacteria can be found in various environments, including the human body, where they can be part of the normal flora, particularly in the throat and on the skin. Some species are harmless, while others can cause infections. Infections caused by Streptokokken can range from mild to severe. Common illnesses include strep throat, skin infections, and pneumonia. Certain strains, like Streptococcus pyogenes, are known for causing more serious conditions, such as rheumatic fever and toxic shock syndrome. Proper hygiene and medical treatment are essential for managing these infections.