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Shigella Species and Serotypes Identified in Tokyo, Japan¹

Numerous studies on the distribution of Shigella have been made in recent years. For the most part these emphasize the predominance of Shigella flexneri⁴ (S. paradysenteriae) types, the paucity of S. dysenteriae (Shiga), the fluctuating, but usually considerable incidence of S. sonnei and the rarity of the types of Boyd and Sachs (2–7). Weil (8) presented an excellent summary of results compiled to 1946. Shigella isolated in this laboratory prior to 1949 (unpublished data) demonstrated that S. flexneri serotype II was the most common (approximately 40 per cent of those isolated) followed closely by S. sonnei (which comprised about 35 per cent of the isolates). Barksdale (9) has indicated, without reference to incidence, those species which have been isolated in Japan. They included virtually all of the important types.

During the period from January 1949 to June 1950, the 406th Medical General Laboratory located in Tokyo, Honshu, Japan, isolated or was called upon to identify 499 Shigella cultures.

¹ Department of Bacteriology, 406th Medical General Laboratory, APO 500, c/o P.M., San Francisco, California.

⁴ The nomenclature used in this report follows that recently proposed by Ewing (1).

^* Deceased.

² Major, MSC, U. S. A.

³ Lt. Colonel, MC, U. S. A.