Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Nocardiosis ?
    ### Response:
    Nocardiosis is a rare disorder that affects the brain, skin, and/or lungs. It occurs mainly in people with a weakened immune system. This condition usually starts in the lungs and can spread to other body organs. Affected individuals usually experience problems with their lungs (chest pain, coughing up blood, fevers), brain (headaches and seizures), and skin (skin infections, ulcers, and abscesses).
    