Natural and experimental vectors.—Blatta orientalis, Italy (Cao, 1898, 1906; Spinelli and Reitano, 1932).
Periplaneta americana, U.S.A. (Gier, 1947): The organism was pathogenic to the cockroach when injected.
† Spirillum periplaneticum Kunstler and Gineste
Habitat.—Periplaneta americana, France? (Kunstler and Gineste, 1906): From intestinal tract.
† Spirillum α, β, and γ Dobell
Habitat.—Blatta orientalis, England (Dobell, 1911, 1912): From hind gut.
Spirillum sp.
Habitat.—Blatta orientalis, U.S.S.R. (Zasukhin, 1930): From intestinal tract.
Cockroaches, Venezuela (Tejera, 1926): From digestive tract.