Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Hemolytic uremic syndrome ?
    ### Response:
    Hemolytic uremic syndrome (HUS) is a disorder that usually occurs when an  E. coli bacterial infection in the digestive system produces toxic substances that destroy red blood cells. Symptoms include vomiting and diarrhea, fever, lethargy, and weakness. In severe cases it can lead to kidney failure or death.
    