| seasonal prevalence of ticks and their association with dermatophilosis in cattle on the accra plains of ghana. | the seasonal abundance of adult ticks on cattle and their association with dermatophilosis were investigated in five herds on the coastal plains of ghana over a 26-month period. four genera, amblyomma, boophilus, rhipicephalus and hyalomma were identified, a. variegatum being the predominant species occurring throughout the year with two peaks of infestation, one in april-may and the other in november. a significant positive correlation was revealed between a. variegatum and dermatophilosis in f ... | 1994 | 7863064 |
| control of amblyomma variegatum and dermatophilosis on local and exotic breeds of cattle in ghana. | the occurrence of dermatophilosis on cattle in the tropics is closely associated with infestation by amblyomma variegatum ticks. animals that are more susceptible to the disease also tend to carry higher tick burdens. longitudinal studies carried out on the accra plains suggest that n'dama cattle acquire an enhanced degree of resistance to these ticks following initial exposure. lesions on zebu-type ghana sanga cattle tend to be confined to the predilection feeding sites of adult a. variegatum e ... | 1996 | 8809991 |
| heartwater in ghana: implications for control of ticks. | heartwater, an often fatal rickettsial disease of domestic ruminants transmitted by amblyomma variegatum ticks, ranks with the a. variegatum-associated skin disease dermatophilosis as a major constraint to the upgrading of livestock productivity in ghana. an epidemiological survey, using new diagnostic tests, is being carried out to determine the incidence and distribution of heartwater and other tickborne diseases in ghanaian cattle, sheep and goats. preliminary results from a longitudinal surv ... | 1996 | 8809994 |
| proceedings of a workshop on the control of amblyomma variegatum and associated diseases. accra, ghana, 4 november 1994. | | 1996 | 8966770 |
| ehrlichia ruminantium seroprevalence in domestic ruminants in ghana; i. longitudinal survey in the greater accra region. | serum samples collected monthly over a 34-month period from cattle, sheep and goats in the greater accra region of ghana were tested for antibodies to ehrlichia (previously cowdria) ruminantium, the causative agent of heartwater, by polyclonal competitive elisa (pc-elisa). maternal antibodies, detected in about half of animals followed from under 1 month old, declined to negative levels within 2-4 months. amblyomma variegatum tick vectors were present on livestock in rural areas throughout the y ... | 2004 | 15145496 |