NO. IO COCKROACHES—ROTH AND WILLIS 81 
Natural vectors.—Blatta orientalis, Italy (Cao, 1898, 1906): Or- 
ganism isolated from the intestinal contents; it retained its virulence 
after passage through the cockroach. 
Sarcina “bianca” and “gialla” of Cao 
Disease —After passage through the gut of the cockroach, the white 
and yellow Sarcina became pathogenic to guinea pigs and rabbits. 
Experimental vectors.—Blatta orientalis, Italy (Cao, 1898). 
Spirochaeta periplanetae Laveran and Franchini 
Disease.—Possibly pathogenic to white mice. 
Natural vectors.—Blatta orientalis, France (Laveran and Franchini, 
1920a): Of five white mice inoculated with the contents of the di- 
gestive tubes of cockroaches inoculated with the spirochaete, one died 
24 hours and another 48 hours after inoculation; two others became 
infected and one was unaffected. However, the pathogenicity of this 
organism is questionable, inasmuch as the entire intestinal contents of 
the insect were inoculated into the mice. 
Streptococcus microapoika Cooper, Keller, and Johnson 
Disease.—From throat and feces of children with enteritis. 
Natural vectors.—Blatta orientalis, Poland ( Nicewicz et al., 1946) : 
Organism isolated from alimentary tract. 
Streptococcus non-hemolyticus II Holman 
Disease.—Isolated from various human and animal infections. 
Natural vectors—Periplaneta americana, England (Shrewsbury 
and Barson, 1948): Organism isolated from alimentary tract. 
PART III. NEGATIVE FINDINGS 
The following organisms were not recovered after they were fed to 
cockroaches. 
Actinomyces asteroides (Eppinger) Gasperini 
[=Streptothrix eppingeri Rossi-Doria (Dodge, 1935).] 
Disease —Organism found in brain abscess and in peritonitis 
(Dodge, 1935). 
Cockroach.—Blatta orientalis (Cao, 1808). 
