The phylogenetic relationship between Cowdria ruminantium and representative members of the orders Rickettsiales and Chlamydiales has been examined on the basis of the sequence of the 16S rRNA. Phylogeny reconstruction by using both parsimony and distance methods supports the conclusion that C. ruminantium is closely related to the Rickettsiales and in particular to the family Anaplasmataceae. ...

Anaplasma and Ehrlichia species are important tick-borne pathogens that cause disease in cattle, dogs, horses and humans; with little information available about these agents in Colombia. The aim of this study was to provide molecular evidence for the presence of Anaplasma sp. and Ehrlichia sp. species in ticks collected from horses, dogs and cattle in Cordoba, Colombia. In this study, 1.105 ti...

A two-year field study was conducted in four communal grazing areas in South Africa. Sera were collected from young cattle (6-18 months old) in these areas during the winters of 1991 to 1993. The sera were tested for antibodies to Babesia bovis, Babesia bigemina, Anaplasma marginale and Cowdria ruminantium. In two of the four areas, treatment with acaricide was erratic and dependent on the disc...

Anaplasma marginale is the etiological agent of a hemolytic disease of cattle, known as anaplasmosis. The organism appears as a marginal inclusion in parasitized erythrocytes, but certain isolates also have bands associated with the inclusion. Inclusions and associated bands in parasitized erythrocytes in the liver and peripheral circulation were studied by light microscope cytochemistry and el...

Tick-borne diseases are widespread in tropical and temperate regions and are responsible for important economic losses in those areas. In order to assess the presence and prevalence of various pathogens in southern Italy, we retrospectively analyzed cattle blood samples collected for a previous study in 2000 using reverse line blot (RLB) hybridization. The study had been carried out in three re...

A seroepidemiological study was conducted on 151 cattle from the Botshabelo and Thaba Nchu areas in the central Free State Province of South Africa, two areas where small scale, peri-urban cattle farming is practised. An indirect fluorescent antibody test was used to test for Babesia bigemina and B. bovis antibodies. To test for Anaplasma marginale antibodies a competitive inhibition enzyme-lin...