HACUs of masked laboratory technician (a Black woman) dissecting monkey kidneys, putting tissues into culture medium in test tubes, carrying out culture distribution, fluid transfer. CUs of fluid flowing into large glass containers. Shots of filtration setup, of red liquid in one of the tanks, of incubator at work while technician checks culture in bottles, noting down data. Shots of introduction of live virus into culture by masked technician, of pre-heating of live virus. Sequence showing technician inspecting virus culture in test tube, looking at it through binocular microscope. Shots of laboratory operations relating to culture of live polio virus. Shots of mixing setup for trivalent vaccine, of first test of vaccine. HAMCS of technician examining vaccine through microscope. CU of stage of microscope. Sequence on some of the operations relative to vaccine production. Shots of roller tube incubator at work, of woman and Asiatic laboratory technician carrying out potency test of vaccine. CU of vials of vaccine, data being recorded. Sequence on bottling of vaccine. Exterior shots of University of Toronto's Connaught Medical Research Laboratory, Spadina division. CU of sign. Sequence on vaccination of howling babies in clinic. Shots of various vaccines made by Connaught Laboratories, salk, insulin.