Periplaneta americana, U.S.A. (Hatcher, 1939): In feces.
Experimental host.—Periplaneta americana, U.S.A. (Babers, 1938): The cockroaches died within 96 hours after being injected with 10-3 ml. of a 24-hour broth culture.
Bacillus circulans Jordan
Habitat.—Soil, water, dust.
Natural vectors.—Blattella germanica, U.S.A. (Janssen and Wedberg, 1952): From intestine and feces.
† Bacillus flacheriae (Hoffman)
Source.—Diseased nun moth larvae.
Experimental infection.—Blatta orientalis, Europe (Filatoff, 1904): The organism was not pathogenic when fed to the cockroach, but killed the insects when injected into the body cavity; after the insects died Filatoff reisolated this pathogen together with another bacillus from the cadavers. He succeeded in culturing the new microorganism and found it to be pathogenic when injected into, but not when fed to, the cockroaches. The diseased insects became sluggish, failed to eat or drink, turned over on their backs, their extremities became totally paralyzed, and they finally died.