We reported a case of Norwegian scabies in 14-year-old male with sepsis, pneumonia, pyopneumothorax and auto immune hemolytic anemia which subsequently became a source of ward epidemic of classical scabies, totalling 25 cases including physicians, nurses, other patients in the same ward and their families. The organisms of scabies on the KOH examination began to decrease 3-5 days after treatment, but they were detccted on the nail, elbow and fingerweb 19 days after treatment.