Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) HIV/AIDS and Infections ?
    ### Response:
    Having HIV/AIDS weakens your body's immune system. Your immune system normally fights germs that enter your body. When HIV/AIDS makes it weak, it can't fight germs well. This can lead to serious infections that don't often affect healthy people. These are called opportunistic infections (OIs).
    