Between November 2018 and May 2019, an estimated 40% of health care organizations have had at least one attack by WannaCry, a ransomware virus (also known as WannaCrypt, Wana Decrypt0r 2.0, WanaCrypt0r 2.0, and Wanna Decryptor). First released in May 2017, WannaCry affects organizations throughout the world that run the Microsoft Windows operating system (Windows OS), especially in the U.S., Vietnam, Turkey, China, and South Korea. Almost 30% of entities in the health care industry are running old, unpatched versions of the Windows OS. Health care organizations are particularly vulnerable because they often have a large number . . .