Microsatellite typing and population structuring of Trypanosoma evansi in Mindanao, Philippines

Trypanosoma evansi, a blood-borne protozoan parasite with an extensive geographical range is the causative agent of the livestock disease known as surra. A total of 140 out of 179 T. evansi isolates collected between 2006 and 2007 from 44 villages (comprising of 16 reported surra outbreaks) in 3 pro...

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Bibliographic Details
Published in:Veterinary parasitology 2012-06, Vol.187 (1-2), p.129-139
Main Authors: McInnes, L.M., Dargantes, A.P., Ryan, U.M., Reid, S.A.
Format: Article
Language:English
Subjects:
Animals
Buffaloes
Cattle
DNA
DNA, Protozoan - genetics
Epidemic
Goat Diseases - epidemiology
Goat Diseases - parasitology
Goats
Horse Diseases - epidemiology
Horse Diseases - parasitology
Horses
Mice
Microsatellite Repeats
Microsatellites
Mindanao
Philippines
Philippines - epidemiology
Phylogeny
Surra
Trypanosoma - classification
Trypanosoma - genetics
Trypanosoma evansi
Trypanosomiasis - epidemiology
Trypanosomiasis - parasitology
Trypanosomiasis - veterinary
Trypanosomiasis, Bovine - epidemiology
Trypanosomiasis, Bovine - parasitology
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Summary:Trypanosoma evansi, a blood-borne protozoan parasite with an extensive geographical range is the causative agent of the livestock disease known as surra. A total of 140 out of 179 T. evansi isolates collected between 2006 and 2007 from 44 villages (comprising of 16 reported surra outbreaks) in 3 provinces (Agusan del Sur (ADS), Surigao del Sur (SDS) and Agusan del Norte (ADN)) in Mindanao, Philippines were each successfully genotyped using a suite of 7 polymorphic microsatellites. The study identified 16 multi locus genotypes (MLG) within the T. evansi isolates and evidence of the spread of surra outbreaks from one village to another, most likely due to the movement of infected animals. Genotyping provided evidence of population sub-structuring with 3 populations (I, II and III (only 1 isolate)) identified. The most abundant population was II, which was the predominant population in ADS and SDS (p=0.022). In addition, buffalo mortality was statistically higher in outbreak areas associated with isolates from population I (13.6%) than with isolates from population II (6.9%) (p=0.047). The present study has highlighted the utility of microsatellite loci to improve understanding of the epidemiology of T. evansi and in tracking surra outbreaks.
ISSN:0304-4017
1873-2550
DOI:10.1016/j.vetpar.2011.12.010