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The epidemiology of tropical theileriosis (Theileria annulata infection in cattle) in an endemic area of Morocco


, : The epidemiology of tropical theileriosis (Theileria annulata infection in cattle) in an endemic area of Morocco. Veterinary Parasitology 44(1-2): 51-65

A longitudinal study of tropical theileriosis was performed on 12 farms in the Doukkala region of Morocco during 1990. Adult Hyalomma detritum detritum were collected between March and early October and a peak in numbers was observed at the end of June. Nineteen percent (24/127) were infected with Theileria species and, amongst these, over 50% had five or more sporoblasts in their salivary glands (range 1-151). Hyalomma d detritum larvae and nymphs were found on cattle between September and early December with the highest numbers in late October. The prevalence of T. annulata piroplasm carriers at the beginning of the year was 48.5% (47 positive out of 97) and there were 14 new infections during the disease season (March to September) of which five developed into clinical cases. The incidence rates of new infection and clinical disease were 0.156 and 0.056 per animal-season, respectively. Differences were observed between age categories of cattle in both tick and parasite infections. A significantly lower number of adult H.d. detritum were collected from calves than from adult cattle. The prevalences of piroplasm carriers before the disease season were 0%, 36% and 76%, respectively, in (a) calves which had been born since the previous disease season, (b) calves born before then and (c) adults. However, the incidence rates of infection and disease for uninfected animals in the two categories of calves were approximately the same: 0.299 and 0.378 new infections, and 0.085 and 0.126 clinical cases per animal-season for (a) and (b), respectively. The date predicted for the appearance of adult H.d. detritum, based on published tick development times and local temperature records, was within 2 weeks of the study visit when the highest number of adults were collected from cattle. However, the date predicted for the appearance of larvae was 6 weeks earlier than the observed peak populations and may indicate that H.d. detritum delays either egg laying in the summer or larval host searching in the autumn.

Accession: 002249985

PMID: 1441192

DOI: 10.1016/0304-4017(92)90143-w

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Related references

Flach, E.J.; Ouhelli, H., 1992: The epidemiology of tropical theileriosis (Theileria annulata infection in cattle) in an endemic area of Morocco. A longitudinal study of tropical theileriosis was performed on 12 farms in the Doukkala region of Morocco during 1990. Adult Hyalomma detritum detritum were collected between March and early October and a peak in numbers was observed at the end of...

Flach, E.J.; Ouhelli, H., 1992: The epidemiology of tropical theileriosis (Theileria annulata) infection in an endemic area of Morocco. A longitudinal study of tropical theileriosis was performed on 12 farms in the Doukkala region Morocco during 1990. Adult Hyalomma detritum detritum were collected between March and early October and a peak in numbers was observed at the end of Ju...

Darghouth, M.E.; Bouattour, A.; Ben Miled, L.; Kilani, M.; Brown, C.G., 1996: Epidemiology of tropical theileriosis (Theileria annulata infection of cattle) in an endemic region of Tunisia: characterisation of endemicity states. A serological survey on tropical theileriosis was conducted on a sample of 54 farms in a region within the semi-arid bioclimatic zone of Tunisia. Screening of cattle sera at a dilution of 1/160 using the indirect immunofluorescent antibody test wi...

Flach, E.J.; Ouhelli, H.; Waddington, D.; Oudich, M.; Spooner, R.L., 1995: Factors influencing the transmission and incidence of tropical theileriosis (Theileria annulata infection of cattle) in Morocco. A longitudinal epidemiological investigation of tropical theileriosis was carried out in an endemic region of Morocco during the 1991 disease season. This involved approximately 220 cross-bred cattle on 15 farms. Data were collected on the frequen...

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Sayin, F.; Dincer, S.; Karaer, Z.; Cakmak, A.; Inci, A.; Yukari, B.A.; Eren, H.; Vatansever, Z.; Nalbantoglu, S., 2003: Studies on the epidemiology of tropical theileriosis (Theileria annulata infection) in cattle in Central Anatolia, Turkey. An epidemiological survey for Theileria annulata infection was conducted in 12 selected villages around Ankara in Central Anatolia, Turkey, during the period April 1990 to January 1993. During the survey, 198 cattle of 30 local breeds, 84 Holstein...

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Brown, C.G.D., 1989: Vaccination against tropical theileriosis (Theileria annulata infection of cattle). The history of the development of cell culture vaccines is followed by a discussion on future studies that should be directed towards epidemiological techniques and genetically engineered vaccines.

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