Dermacentor andersoni, demonstration of Anaplasma marginale in hemolymph by animal inoculation and fluorescent antibody technique

Theileria mutans, 4 isolates obtained from geographically distant parts of South Africa by subinoculation of infected blood were readily transmitted to cattle by Amblyomma hebraeum, all attempts to transmit these isolates with Rhipicephalus appendiculatus were unsuccessful

Anaplasma marginale, transstadial transmission by Rhipicephalus simus, successful transmission to oxen by tick stabilate prepared from infected male ticks

influence of parasitemia level of calves at time of feeding by Dermacentor andersonii upon development of Anaplasma marginale in the ticks

Babesia occultans n. sp. originally obtained from engorged female Hyalomma marginatum rufipes collected from cattle in Northern Transvaal, transmission studies in laboratory strain of ticks and splenectomized cattle, morphological, serological, and cross-immunity studies distinguished parasite as previously undescribed species highly infective for H. marginatum rufipes but of low virulence in cattle, unsuccessful attempt to transmit transovarially with Boophilus microplus

Amblyomma hebraeum, 60CO irradiation of nymphs failed to attenuate Cowdria ruminatium

Babesia sp. in Hyalomma marginatum rufipes, laboratory transmission to susceptible cattle achieved both biologically (tick feeding) and mechanically (injection of infected blood), low pathogenicity, apparently not transmissible to horses

Rhipicephalus simus, 5 types of Anaplasma marginale colonies demonstrated in midgut

Dermacentor andersoni, density, size, type, and distribution of colonies of Anaplasma marginale in gut of ticks incubated at 37 C for various periods

Babesia bovis, B. bigemina, cattle, effect of tick control on infection rates and on enzootic stability, survey of farms from 6 geographical regions, control of ticks is not justified economically as means of minimizing risks of babesiosis outbreaks unless regular dipping is necessary to limit damage done by ticks per se