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dc.contributor.advisorRussell, Leon H.
dc.creatorDavis, Donald Stith[1979]
dc.description"Submitted to the Graduate College of Texas A & M University in partial fulfillment of the requirement for the degree of Doctor of Philosophy August 1979"en
dc.descriptionApproved as to style and content by: L.H. Russell, J.E. Grimes, R.M. Robinson, John D. Williams, Norman D. Heidelbaughen
dc.descriptionIncludes bibliographical references (leaves 55-63)en
dc.description.abstractThe prevalence of Brucella abortus, Trypansoma cruzi, Rickettsia rickettsii, and rabies virus serum antibodies in wild-trapped coyotes (Canis latrans) from various areas of southeastern and southern Texas were determined. The buffered Brucella antigen (card), rivanol precipitation, standard agglutination tube, and cold complement fixation tube tests were utilized to detect B. abortus serum antibodies. Of 117 coyotes collected from 12 counties 23.9% (28) from 8 counties had some reactivity to these tests. Fifteen percent (17) had significant levels (positive by two or more tests) of serum antibodies to B. abortus. No appreciable change in antibody titer was observed during 100+ days in two serologically positive coyotes. Brucella abortus was isolated from various tissues from 18.6% (8/43) of the coyotes. Vertical transmission from a naturally infected female coyote to three pups was detected. An attempt to experimentally infect 4 serologically negative coyotes by conjunctival inoculation with B. abotus biotype 2 was unsuccessful. The rapid fluorescent focus inhibition test (RFFIT) which was utilized to detect rabies virus antibodies in 70 sera from coyotes collected from 6 counties determined that 10% (7) were positive. The positive sera were from coyotes collected in three of the counties. The latex agglutination and direct agglutination tests were used to determine the prevalence of T. cruzi serum antibodies in coyotes collected from 6 counties. Four percent (3/72) were serologically positive as indicated by the latex agglutination tests. Eleven percent (8/72) were serologically positive at a serum dilution>??1:128 as deterimined by the direct agglutination method. The seropositive coyotes were collected from three of the counties. The prevalence of R. rickettsii serum antibodies in coyotes collected from 9 counties was 5.4% (4/74) by the complement fixation micotiter technique. The serologically positive coyotes were collected from three counties.en
dc.format.extentxi, 78 leaves : illustrations, mapsen
dc.rightsThis thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use.en
dc.subjectVeterinary Public Healthen
dc.subject.classification1979 Dissertation D261
dc.titleA serologic survey for four zoonotic diseases in coyotes (Canis latrans) in selected areas of Texas : a dissertationen
dc.typeThesisen Medical Sciencesen A&M Universityen of Philosophyen
dc.contributor.committeeMemberGrimes, J. E.
dc.contributor.committeeMemberRobinson, R. M.
dc.contributor.committeeMemberWilliams, J. D.
dc.format.digitalOriginreformatted digitalen
dc.publisher.digitalTexas A&M University. Libraries

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