... the winter. Am J Epidemiol, pp 86, 112 -136 . 90 33. Bordie M, Park W. H (1936). Active immunization against Poliomyelitis. Am.J.Pubilic Health, pp 26, 119 -125 . 34. Brown F (ed) (1996). ... Requirements for Poliomyelitis vaccine (oral), requirements for biological Substances No.7. 1987, pp 117 -118 . 93. WHO. Technical Report series. No 904. 2002, pp 43. 94. WHO. Recommandations ... nguyên H) [5], [7], [10], [11] , [12], [14], [16], [19], [21], [71]. Kháng nguyên D có hằng số lắng là 160S, còn kháng nguyên C có hằng số lắng là 80S – 90S [7], [11] , [14], [16], [19], [21]....