A controlled field trial of a serogroup A meningococcal polysaccharide vaccine.
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E. Gotschlich | R. Triau | J. Sippel | B. Cvjetanović | R. Hablas | W. Sanborn | N. Girgis | M. Wahdan | F. Rizk | A. el-Akkad | A. el-Ghoroury | A. Amer | W. Boctar | el-Akkad Am | Sanborn Wr | el-Ghoroury Aa | Wahdan Mh | Girgis Ni | Sippel Je