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When poliomyelitis vaccine was packaged for distribution some months ago, directions for use were included in the packages. These directions are now causing some confusion, since the original package inserts may not contain current recommendations but rather the schedule used in the 1954 field trial. Actually, the situation can be simply stated so far as most recent recommendations from Dr. Jonas Salk are concerned. They are in line with statements appearing in the August 6, 1955, issue of The Journal, pages 1244-1246. The second dose can be given as early as two weeks after the first, although the optimal time is felt, by Dr. Salk, to be four to six weeks. The third dose should be given approximately seven months or longer after the second dose. Southern physicians, of course, may have to adjust their schedules because the poliomyelitis season arrives earlier there than in the northern part of the
SECOND INJECTION OF POLIOMYELITIS VACCINE. JAMA. 1955;159(13):1303. doi:10.1001/jama.1955.02960300049013
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