Epidemiological study of the seroprevalence of Anaplasma ovis in small ruminants in Saint Lucia (Auria King-Cenac)

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Abstract

In Saint Lucia, livestock is affected by two tick-borne diseases: Anaplasmosis and Babesiosis (vector: Boophilus sp.). Heartwater has never been identified on the island, despite the presence of its vector (tropical bont tick, TBT). TBT is controlled through the use of extensive or strategic acaricide treatment: the Bayticol. The control efforts were successful in significantly reducing the prevalence of TBT.

In other islands, the use of such strategies may have led to the emergence of animals highly susceptible to other tick-borne diseases. In St. Lucia, livestock owners have noted that some animals from regularly bayticol-treated flocks would succumb to anaplasmosis or babesiosis when moved to another location.

The objectives of the study were to determine the prevalence of small ruminant farms in Saint Lucia which are positive for Anaplasma ovis and the geographical distribution of positive farms.

The total number of small ruminant farms and animals to sample was calculated based on the assumptions of an expected herd seroprevalence of 50%. Ticks and serum samples have been collected and the farmers have been interviewed (questionnaire on biosecurity measures, treatment for ticks, etc.).

The prevalence of Anaplasma ovis and some weakness in the laboratory-handling of samples and traceability have been identified.

 

Authors:

King-Cenac, A1*, Joseph, G.1, Polius, C1.; Sameol, G.1, Delgado A.2, Shaw, J.3, Lefrançois T.4, Bournez, L.4,

 1. Ministry of Agriculture, Lands, Forestry and Fisheries. Veterinary and Livestock Services Division, Union, Castries, St. Lucia, * auriaking@yahoo.com

2. IICA

3. USDA

4. CIRAD, UMR CMAEE - Domaine de Duclos, Prise d'eau, 97170 Petit Bourg, Guadeloupe, French West Indies

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