180 



OTHER SPOROZOA 



Fig. 55. Bartonella bacilliformis in stiiined blood 

 from Oroya fever patient. Some cells show chains of 

 parasites. Bodies with large dark nuclei are leuco- 

 cytes (leuc). X about 1000. (After Strong et al.) 



cells are minute 

 rounded bodies, some- 

 times a few, some- 

 times great masses of 

 them (Fig. 56B). 

 Some of these rounded 

 bodies contain only 

 one, two or four deep 

 staining granules 

 (Fig. 56A), while 

 others contain large 

 numbers of them. 

 It appears that these 

 granule - filled bodies 

 break up into a large 

 number of parts each 

 containing one gran- 

 ule; these become 

 elongated, and finally 

 appear as distinct rods 

 containing the gran- 

 ule at one end. In 

 this condition they 

 are identical with the 

 parasites which occur 

 in the red blood cor- 

 puscles (Fig. 56C) and 

 indicate the manner 

 in which the corpus- 

 cular parasites arise. 

 Dr. Strong and his 

 colleagues believe 

 Bartonella bacilli- 

 formis to be a pro- 

 tozoan probably re- 

 lated to the group of 

 parasites known as 

 the Piroplasmata, including the Texas fever parasite of cattle and 

 a number of other disease-causing parasites of wild and domestic 

 animals. Its exact classification cannot yet be determined, and 



Fig. 56. Development of Bartonella bacilliformis 

 in endothelial cells. A, endothelial cell, with large 

 nucleus (n.) at left, containing five rounded bodies in 

 early stage of development; B, endothelial cell show- 

 ing rounded bodies developing large numbers of small 

 rod-shaped parasites; C, red corpuscles lying near 

 with parasites identical with those escaping from such 

 a cell as shown in B. X 2000. (After Strong et al.) 



