2017, Number 1
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Vet Mex 2017; 4 (1)
Using spatial tools for high impact zoonotic agent surveillance design in backyard production systems in central Chile
Alegria-Moran R, Lazo A, Urcelay S, Hamilton-West C
Language: English/Spanish
References: 27
Page: 1-9
PDF size: 770.58 Kb.
ABSTRACT
Specific locations of backyard production systems (BPSs) in Chile remain
unclear, creating dificulties for designing surveillance activities for promptly
detecting zoonotic agents with high impacts on health, such as avian influenza
and
Salmonella spp. This study aims to prove the use of spatial tools
for improving the surveillance of BPSs in central Chile. A stratified and proportional
random sampling was performed in 15 provinces of the Valparaiso,
Libertador General Bernardo O’Higgins and Metropolitana regions. In this
sampling, 329 BPSs were detected. In the first stage, 329 random sample
points were allocated within the study area that searched for BPSs with poultry
or swine breeding. Then, these random points were validated with remote
sensing and in the field by searching for the presence of rural or semi-rural
areas, nearby crops and houses or small towns within a 5 km radius around
each point, while points allocated over hills or water sources (lakes or rivers)
were discarded. Over 70 % of the sampling points were correctly allocated.
In Los Andes, Cordillera and Chacabuco, less than 50 % of the points were
allocated within feasible sampling areas.
From the total BPSs sampled, 89 % met the 5 km radius criteria, and
in the provinces of Valparaiso, Cordillera and Cachapoal, over 20 % of the
sampling points were outside the radius criteria. This study is the first in
Chile to explore the locations and sanitary statuses of BPSs. Given the lack
of knowledge about the specific locations of BPSs, their identification during
field activities represents a high cost for the surveillance of pathogens. We argue
that using spatial tools in BPS surveillance design is an important support
for healthcare management.
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