80 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 134 
Natural vectors—Blatta orientalis, Italy (Cao, 1898, 1906): Iso- 
lated from the intestinal contents. 
Experimental vectors —Blatta orientalis, Italy (Cao, 1906): Or- 
ganism that was recovered from feces after being fed to the insects 
was lethal to guinea pigs within 48 to 60 hours. 
“Bacillo del barbone dei bufali”’ of Cao 
Experimental vectors ——Blatta orientalis, Italy (Cao, 1898): The 
bacillus of buffalo cholera retained its virulence after ingestion and 
passage through the insect. 
“Bacillo similcarbonchio” of Cao 
Disease —An anthraxlike bacterium pathogenic to guinea pigs, 
rabbits, and pigeons. 
Natural vectors ——Blatta orientalis, Italy (Cao, 1898, 1906): Iso- 
lated from the intestinal contents. 
Experimental vectors—Blatta orientalis, Italy (Cao, 1906): 
Strains C and D of this organism killed guinea pigs when reisolated 
from the cockroach’s feces. 
“Bacillo similtifo” or “Bacillo tifosimile’”’ of Cao 
Disease-—A typhoidlike bacterium pathogenic to guinea pigs and 
rabbits. 
Natural vectors.—Blatta orientalis, Italy (Cao, 1898, 1906): Iso- 
lated from the intestinal contents. 
Experimental vectors——Blatta orientalis, Italy (Cao, 1906): Or- 
ganism acquired pathogenicity on passage through intestinal tracts of 
cockroaches after being fed to the insects in a liver infusion. The 
bacteria survived in the intestines for 2 to 3 months. 
Paracolon bacilli 
Source.—May cause clinical dysentery. Strains of paracolon bacilli 
have been isolated from cases of enteritis in man, food poisoning, 
infections of genitourinary tract, powdered eggs, and fatal infections 
in chickens, turkeys, and snakes. 
Natural vectors——Cockroaches (presumably Blatta orientalis, 
Blattella germanica, and/or Periplaneta americana), Egypt (El-Kholy 
and Gohar, 1945): Organisms isolated from suspensions of macer- 
ated whole insects. 
Sarcina alba “patogena” of Cao 
Disease.—Pathogenic to guinea pigs and rabbits. The organism 
differed from Sarcina alba only in its pathogenic properties. 
