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Moore , D. H. (The Rockefeller University, New York, N. Y.), R. N.Arison, H. Tanaka, W. T. Hall, and M. Chanowitz . Identity of the filterable hemolytic anemia agent of Sacks withHaemobartonella muris . J. Bacteriol.90: 1669–1674. 1965.—In 1960 a new hemolytic agent in rats was reported. It was thought to be a filterable, nonsedimentable, replicating infectious agent, different fromHaemobartonella muris . Rats which recovered from the infection developed a resistance to several kinds of transplantable tumors. It is here shown that this agent has the same properties as those reported in the literature and reconfirmed by us forH. muris . The size of the agent is approximately 500 mμ as determined by correlating bioactivity with Gradocol membrane filtrates and fractions from a diffusion cell, and its density is about midway between that of whole serum and distilled water (approximately 1.020) as determined by the sedimentation of bioactivity in an ultracentrifuge. Diffusion at 30 C indicated a lack of motility by the agent bodies. Rats were found to be protected against infection with the agent by daily administration of chlortetracycline and by prior infection withH. muris . The agent bodies were indistinguishable fromH. muris in both the light and the electron microscope.

Identity of the Filterable Hemolytic Anemia Agent of Sacks with Haemobartonella muris