Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Mycobacterial Infections ?
    ### Response:
    Mycobacteria are a type of germ. There are many different kinds. The most common one causes tuberculosis. Another one causes leprosy. Still others cause infections that are called atypical mycobacterial infections. They aren't "typical" because they don't cause tuberculosis.
    