Colonies of Shigella paradysenteriae var. Sonne are characterized on lactose and sucrose agar media by the formation of papillae after several days' incubation at 37° C. Organisms in the papillae dissimilate lactose or sucrose with the formation of acid within 24 hours, whereas the remaining organisms in the colony fail to show acid production on china blue-rosolic acid differential medium. The acid papillae appear blue on a pink colony. In a liquid medium containing sucrose or lactose, alkaline organisms reach a maximum after two to six days followed by a decline of alkaline organisms with a marked increase of acid producing forms (rapid variant).
Proceedings of the Iowa Academy of Science
©1933 Iowa Academy of Science, Inc.
Reynolds, Howard; McCleskey, C. S.; and Werkman, C. H.
"Sugar Dissimilation by Shigella paradysenteriae Variety Sonne,"
Proceedings of the Iowa Academy of Science, 40(1), 81-82.
Available at: https://scholarworks.uni.edu/pias/vol40/iss1/25