<prompt> In a surgical post-op Ward , a patient developed a wound infection . Subsequently 3 other patients developed similar infections in the ward. What is the most effective way to limit the spread of infectionFumigation of the wardGive antibiotics to all the other patients in wardProper handwashing of all ward personnelsWash ot instruments with 1 perchlorate  <response>: Given the prominence of cross infection , hand washing is the single most impoant preventive measure in the hospital . Use of alcohol hand rubs between patient contacts is now recommended for all health Care workers except when the hands are visibly soiled , in which case washing with the soap and water is required - Harrison 15e 