TABLE 1.

Ehrlichial strains studied

Organism	Strain	Source
HGE agent	Webster	J. S. Dumler, The Johns Hopkins Medical Institutions, Baltimore, Md.
E. equi	MRK	J. E. Madigan, University of California, Davis
E. phagocytophila	1602	A. Garcia-Perez, Fundation Hospital Alcoron
A. marginale	South Idaho	G. Palmer, Washington State University
A. marginale	Florida	G. Palmer, Washington State University
A. centrale	Aomori	Y. Terada, National Institute of Animal Health
E. canis	Oklahoma	J. Dawson, Centers for Disease Control and Prevention, Atlanta, Ga.
E. chaffeensis	Arkansas	J. Dawson, Centers for Disease Control and Prevention, Atlanta, Ga.
E. muris		M. Kawahara, Nagoya City Public Health Research Institute
Ehrlichia detected from I. ovatus	Yamaguchi	H. Inokuma
C. ruminantium		C. E. Yunker, University of Pretoria, Pretoria, Republic of South Africa
E. risticii	ATCC
E. sennetsu	Miyayama	G. Dasch, Naval Medical Research Center, Bethesda, Md.
N. helminthoeca		Y. Rikihisa, Ohio State University, Columbus