Streptococcus is a type of bacteria that can cause various infections in humans and animals. There are many synonyms for the word streptococcus, including strep, streptococci, streptococcic, streptococcous, and streptococcal. Other related terms include Group A streptococcus, Group B streptococcus, and Group D streptococcus. These bacteria are commonly found in the respiratory tract, skin, and gastrointestinal tract of humans and animals. Streptococcal infections can range from mild to severe, including strep throat, pneumonia, and invasive infections. Accurate diagnosis and appropriate treatment are important in order to prevent potential complications and spread of infection.