NO. IO COCKROACHES—ROTH AND WILLIS 79 
later, contained bacilli morphologically identical to M. tuberculosis. 
U.S.A. (Read, 1933) : The insects were fed tuberculosis sputum for 
48 hours. After the insects had been fed, their digestive tracts were 
ground and injected into guinea pigs ; these animals developed typical 
tuberculous lesions, 
Mycobacterium spp. 
Disease.-—Most species in this genus are animal parasites. 
Natural vectors——Periplaneta americana, U.S.A., Texas (D. W. 
Micks, p.c.; Liebovitz, 1951): Organism isolated from intestinal 
tract. 
Family ACTINOMYCETACEAE 
Nocardia sp. (?) 
Disease—Nocardiosis is an infection, caused by various species of 
this genus, with symptoms similar to peritonitis, pneumonitis, pseudo- 
tuberculosis, meningitis, abscesses. 
Natural vectors —Periplaneta americana, U.S.A., Texas (Leibovitz, 
1951): Organism, tentatively identified as Nocardia sp., was iso- 
lated from macerated intestines of cockroaches that had been captured 
in sewers. 
PART IIT. PATHOGENIC BACTERIA WHOSE TAXONOMIC 
POSITION IS UNCERTAIN 
The following organisms are either not listed in Breed et al. (1948) 
or are stated by them to be difficult to classify. 
“B. aerobio del pseudoedema maligno” of Cao 
Disease —Pathogenic to rabbits. 
Natural vectors——Blatta orientalis, Italy (Cao, 1906): Isolated 
from feces. 
“B. del pseudoedema maligno” of Cao 
Disease.—Pathogenic to guinea pigs. 
Natural vectors——Blatta orientalis, Italy (Cao, 1906): Organism 
isolated from feces. 
“Bacillo proteisimile” of Cao 
Disease——A Proteus-like organism pathogenic to guinea pigs and 
rabbits. 
