ALMOST 400,000 shots of poliomyelitis vaccine were given in a mass immunization campaign in Salt Lake City, Utah, in 1957. From the inception of the campaign, arising from pressures of various civic groups early in 1957, until its end in July of that year, streams of people passed through clinics in schools, churches, department stores, and other places to receive their injections. A total of 116,710 vaccine injections were given at clinics held in 127 schools, 25 churches, and 40 industrial firms, business offices, and stores. In addition, 275,130 injections were given in the offices of private physicians. Altogether, 62 percent of the city's residents were immunized. The Salt Lake County Medical Society sponsored the vaccination program and appointed me as coordinator. Scheduling of clinics for all schools was begun at once through my office. Within 4 weeks all the schools and businesses that sought vaccination for their employees were accommodated. The nurses alnd equipment were supplied by the Salt Lake City and County Health Departments. The first clinics were arranged for 500 employees of a major department store and for a junior hiigh school where two students had died of poliomyelitis in 1956. For the school clinic, the PTA purchased vaccine from a local druggist at the commercial rate until it could be bought at the institutional price directly from drug firms. The second school clinic was sponsored by a local Lion's Club. Newspaper and radio publicity resulted in a crowd of 2,450 persons. The challenge here was to obtain enough syringes so that there would be a separate one for each person. The city health department had only 1,500 syringes. Four hundred more, relics of the poliomyelitis pioneer programs, were found in the basement of the State Capitol. All hospitals were asked to have syringes ready in case of need. Since the second clinic was to last from 6 p.m. until 10 p.m., the first 300 syringes used were cleaned, packed, and rushed to a nearby hospital for autoclaving and were returned for the last hour. The problem of syringes continued to be the knottiest one of all throughout the campaign. Disposable syringes were too expensive: at 18 cents per unit, it would have meant $180 in the waste basket for every 1,000 persons injected. Interchangeable 2 cc. syringes were best. Dr. Hingson's jet-injector, which injects 900 persons per hour would have been ideal, but it was not then available.