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3. High attack rate in specific age group.
4. Adequate health and education facilities.
5. Socio-economic factors, geographic location, etc. to provide a significant cross-section study.
The vaccine to be used in the study is composed of killed virus of all three polio virus types which have been grown in test-tube cultures of monkey kidney tissues. The virus is killed bp exposure to formalin and is prepared in a watery solution. This is called the aqueous type. Each child will receive three injections (1 c. c. eslch) of vaccine, the first
88.0%