Getty Images Last Tuesday, Jason Cabot prepped for an abdominal surgery: he fasted for 24 hours and drank three tablespoons of intestine-cleansing milk of magnesia. But until he showed up at 5:30 a.m. the next day at Scripps Mercy Health in San Diego, he had no idea if the surgery was going to happen. Scripps Health, a large health system in California, on May 1 experienced a "disruption" to its IT systems, which has since been tied to malware discovered on the health system's computer network. To contain the malware, Scripps said it took a portion of its network offline, disrupting access to the health system's email servers, patient portal and other applications.