Prevalence of ticks (Acari: Ixodidae) and Theileria annulata infection of cattle in Gezira State, Sudan

Abstract

This study was conducted in Gezira State, central Sudan during January, May and August 2014 to determine species of ticks infesting cattle and prevalence of Theileria annulata infection and antibodies. A total of 200 head of cattle were sampled for ticks, blood smears, lymph node biopsy smears and sera from five study areas. Zebu (Butana and Kenana) and cross-bred (Zebu X Friesian) cattle of both sexes were sampled. Cattle age groups were younger than one year, one year to younger than four years and four years and older. Coat colour of cattle was recorded. The results revealed that cattle were infested with Rhipicephalus evertsi evertsi (n = 562, 51.6%), Hyalomma anatolicum (n = 289, 26.5%), H. rufipes (n = 70, 6.4%), R. sanguineus sanguineus (n = 59, 5.4%), R. decoloratus (n = 39, 3.6%), Amblyomma lepidum (n = 35, 3.2%), H. impeltatum (n = 26, 2.4%) and H. dromedarii (n = 9, 0.8%). Out of 200 blood and biopsy smears, 33 (16.5%) showed piroplasms for Theileria spp., while 29 (14.5%) were positive for Theileria spp. schizonts. Seropositivity for T. annulata using indirect fluorescent antibody (IFA) test was 94 (47%). It is concluded that there are three genera of hard ticks and eight species in Gezira State and tropical theileriosis is endemic in the state. These findings are the first records in Gezira State, Central Sudan and it is highly recommended to consider the endemicity of tropical theileriosis particularly in cattle upgrading programmes.