Since 2001, more than 150,000 patients nationwide have been victims of unsafe injection practices, and two-thirds of those risky shots were administered in just the past four years, according to data from the U.S. Centers for Disease Control and Prevention. The errors led to at least 49 disease outbreaks, a USA TODAY examination shows, and a trail of victims suffering with potentially life-threatening bacterial infections, such as MRSA, and sometimes fatal viruses, such as hepatitis.