[Antidysenteric vaccination. XV. Immunogenicity of various strains of Shigella schmitzi Shigella flexneri 1b, 2b, 3a, 4, 6, Shigella boydii and Shigella sonnei "S" in relation to the immunogenicity of a keratoconjunctivitis positive enterobacterium lacking Shigella antigens (agglutinogens) (strain "well 3")].