Stanimar is staying in the hospital after surgery. He starts to suffer from a fever, diarrhea, and abdominal pain. How did Stanimar most likely contract his nosocomial infection? A urinary catheter was not properly sterilized before it was used. O Anurse did not properly disinfect her hands before she inserted the ventilator during surgery. O Ahealth-care worker did not disinfect her hands after she helped another patient to the bathroom. O The surgical instruments that were used during his surgery were not properly cleaned before his procedure.