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The present report summarizes the results of field and laboratory studies designed to determine the role of mites as possible vectors or reservoirs of Western equine encephalomyelitis. It is concluded from these studies that although occasionally chicken mites or wild bird mites are found to be naturally infected with this virus they play no essential role in the epidemiology of the disease. The demonstration of the Western equine virus in chicken mites or in wild bird mites may be significant only as an indication that they have recently fed on infected chickens or wild birds.
1 These studies were supported by a grant from the Rose Lampert Graff Foundation, Los Angeles, California, and the Caruth Foundation, Dallas, Texas.
2 While these studies were in progress numerous persons assisted in the collection of specimens for analysis. For their kind cooperation the authors are indebted to Mr. George L. Carpenter, Typhus Control Supervisor, U.S.P.H.S.; Drs. H. H. Casper and T. J. Anderson, State Livestock Sanitary Commission; Dr. A. F. Davis, City Veterinarian, Beaumont, Texas. For technical assistance the authors are indebted to George C. Patterson and Cleo Hausman.
3 Present address: University of Maryland, School of Medicine, Baltimore, Maryland.
4 Present address: Yale University School of Medicine, New Haven, Connecticut.
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