Experimental vector.—Blattella germanica, Germany (Vollbrechtshausen, 1953): Nonpathogenic to the insect when injected into the mouth or anus.
"Silkworm disease bacillus"
Cockroaches that were inoculated with living cultures succumbed in a few days (Glaser, 1925).
† Spirillochaeta blattae Hollande
Habitat.—Blatta orientalis, France (Hollande, 1934; Hollande and Hollande, 1946): Organism found in hind intestine. This spirillum was stated to be related in external morphology to Spirillum periplaneticum Kunstler and Gineste, but it was believed that S. blattae should be in the Spirochaetaceae rather than the Spirillaceae.
"Spirochaetoid bacteria"
Habitat.—Blatta orientalis, France (Hollande, 1934): Two kinds described but not named.
† Tetragenous sp.
Natural and experimental infections.—Periplaneta americana, U.S.A. (Gier, 1947): Pathogenicity to the cockroach variable when organism injected.