Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Streptococcal Infections ?
    ### Response:
    Strep is short for Streptococcus, a type of bacteria. There are two types: group A and group B.    Group A strep causes       - Strep throat - a sore, red throat, sometimes with white spots on the tonsils    - Scarlet fever - an illness that follows strep throat.
    