CU of head of Jersey cow behind paige fence. Shot of cows, farm buildings in background. HACS of truck loaded with milk can moving past camera. Shots of truck driving up to farm in background, of truck stopping at barn, of man loading milk cans on truck, of milk cans moving on conveyor, of men unloading empty cans from truck. Various shots of man at work in laboratory, pouring liquid in tubes. CU of man's hand making slide with samples of milk. CUs of headlines re typhoid fever, vaccine being prepared. MSs of machine washing milk cans, cans coming out. HASs of man watching milk being mixed, of interior of milk mixing bath. Shot of man at work in laboratory, milk bottles on table. CS of hand dripping liquid in solution, clear solution getting opaque. MCS of man looking into microscope.