A Study of Shigella flexneri, Sh. boydii and Sh. sonnei by Precipitation and Agglutination Reactions Brodie, J. and Green, D. M.,, 5, 1001-1009 (1951), doi = https://doi.org/10.1099/00221287-5-5-1001, publicationName = Microbiology Society, issn = 1350-0872, abstract= Summary: Antisera, prepared against smooth variants of the Flexner, Boyd and Sonne types of Shigella, were investigated for their agglutinin and precipitin content. The precipitation reactions, employing formamide extracts of the organisms, showed a marked degree of specificity which was lacking in the agglutianation reactions except with the Boyd and Sonne types. Cross-precipitation reactions occurred with Boyd’s Flexner IV (103) and Flexner Y and also with Boyd’s Flexner V(P110) and Flexner X. Absorption tests, however, revealed each of these four organisms to have a predominant specific precipitinogen., language=, type=