FAMILY BARTOXELLACEAE 



iio"; 



branched forms. Coarser filaments ap- 

 pear to rise from rounded granules. Del- 

 icate rods are preponderant, and minute 

 coccoids appear occasionally. When 

 transferred to the common deer mouse, 

 coarser forms appear, including filaments 

 and large coccoids, sometimes in chains. 



Pathogenicity : Pathogenic for gray- 

 backed deer mice and the common deer 

 mouse, but non-infective for splenectom- 

 ized white mice. 



Habitat : Blood of the gray -backed deer 

 mouse {Peromyscus maniculatus gra- 

 cilis). 



8. Haemobartonella blarinae Tyzzer. 

 (Proc. Amer. Philos. Soc, 85, 1942, 382.) 

 Named for the genus of shrews, Blarina. 



Extremeh^ pleomorphic with delicate 

 rods and coccus-like forms, often occur- 

 ring in chains which also contain larger 

 elements which have a deeply stained, 

 bead-like granule. In the early stages of 

 infection they may occur as thick bands 

 or filaments stretching over the red 

 cells usually with a bead or granule. 



The bands take a bluish tint with 

 Geimsa's stain, while the more delicate 

 form stains a slat}' violet. The head is 

 distinctly reddish. In the fully de- 

 veloped infection, I'ods and filaments pre- 

 dominate over rounded forms. The or- 

 ganisms may be scattered on the svu'facc 

 of the red cells or may form a dense cap 

 which is intensel}^ stained. Rudimen- 

 tary mycelia may be found radiating 

 from a central portion and reddish stained 

 material with ill-defined contours may 

 occur at the ends of the mycelial 

 branches. 



Pathogenicity: Pathogenic for the 

 short-tailed shrew but not for deer mice 

 or white mice. Causes anemia in the 

 shrew. 



Habitat: In the blood of the short- 

 tailed shrew {Blarina brevicauda) . 



9. Haemobartonella sciurii Tyzzer. 

 (Proc. Amer. Philos. Soc, 55, 1942, 385.) 



Named for the genus of gray squirrels, 

 Sciwus. 



Very pleomorphic. Occurs as minute 

 rods and filaments which are continuous 

 or segmented. The rods and filaments 

 vary in thickness, some are very uneven 

 and some very coarse. Beaded chains 

 ma3' develop from the thickened forms. 



The bead-like elements stain a dull 

 reddish at the periphery with Giemsa's 

 stain while the remainder is very faintly 

 stained in contrast to the intensely stain- 

 ing basophilic rods and filaments. Some 

 of the rounded forms have the appearance 

 of large, thick rings. Beads and rings 

 may arise from slender deeply staining 

 rods, simulating verj' closely spores 

 within bacilli, though no germination 

 of filaments from them has been observed. 



Pathogenicity : Slightl}' pathogenic for 

 the gray squirrel, non-pathogenic for 

 normal white mice. 



Habitat : Blood of the gray squirrel 

 (Sciurus carolincnsis leiicotis). 



Appendix: Here are included (1) Hae- 

 uiohartonella of undetermined specific 

 rank, (2) Haentobartonella-like struc- 

 tures in non-splenectomized mammals 

 and in cold-blooded animals, (3) Invalid 

 species (see Weinman, Trans. Amer. 

 Philosoph. Soc, N. S., 33, 1944, 315). 



1. Hameobartonellae of undetermined 

 specific rank. Microorganisms are 

 grouped according to host of origin and 

 are considered to be haemobartonellae 

 from the description of the original 

 author; but the information furnished is 

 not sufficient for further classification. 



Haemobartonellae similar to Haemo- 

 harlonella muris in wild rats : Miis decu- 

 manus, Mus norvegicus, Rattus rattiLs 

 frugivorus, Mus rattus griseiventer, Mus 

 rattus rattus, Mus sylvaticiis. In vari- 

 ous rats; technical names not given. 



Haemobartonellae similar to Haemo- 

 bartonella tniiris in albino mice. Schil- 

 ling (Klin. Wchnschr., 1929, 55) separated 

 the haemobartonella of the mouse from 



