* Streptococcus spp.
Natural vectors.—Blatta orientalis, Germany (Jettmar, 1935).
Blattella germanica, Germany (Jettmar, 1935); U.S.A. (Janssen and Wedberg, 1952).
Cockroaches, U.S.A. (Longfellow, 1913).
Experimental vectors.—Blatta orientalis, Italy (Cao, 1898).
Family CORYNEBACTERIACEAE