Epidemiology of chagas disease in northern argentina
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Epidemiology of Chagas disease in Northern Argentina. Uriel Kitron, Univ. of Illinois Ricardo E. Gurtler, Univ of Buenos Aires Heinrich Zu Dohna, Rockefeller Univ.   Ellen M. Dotson, CDC Maria C. Cecere, Univ of Buenos Aires Open discussion Symposium, ASTMH 53 rd Annual Meeting

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Epidemiology of Chagas disease in Northern Argentina

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Epidemiology of chagas disease in northern argentina

Epidemiology of Chagas disease in Northern Argentina

Uriel Kitron, Univ. of Illinois

Ricardo E. Gurtler, Univ of Buenos Aires

Heinrich Zu Dohna, Rockefeller Univ.  

Ellen M. Dotson, CDC

Maria C. Cecere, Univ of Buenos Aires

Open discussion

Symposium, ASTMH 53rd Annual Meeting

Miami, FL, Nov. 10, 2004


Infectious diseases grants awarded by nih and nsf

Infectious diseases grants awarded by NIH and NSF

Joint program supports initiatives that seek to understand the ecological and biological mechanisms that govern relationships between human-induced environmental changes and the emergence and transmission of infectious diseases.

http://www.nsf.gov/bio/pubs/awards/eid.htm


4 eco epidemiology of chagas disease in northwest argentina

4. Eco-Epidemiology of Chagas Disease in northwest Argentina

  • Ricardo Gurtler, M. Carla Cecere Gonzalo Vazquez-Prokopec, Paula Marcet, Judith Schachter Broide, Leo Ceballos, Victoria Cardinal – Univ. of Buenos Aires, Argentina

  • Joel Cohen, Heinrich Zu Dohna - Rockefeller University, NY

  • Sonia Blanco, Cynthia Spielman, Delmi Canale – National Vector Control Program, Argentina

  • Ellen Dotson, Ben Beard - CDC

  • Uriel Kitron, Anna Schotthoefer, Janet Thornhill - Univ. of Illinois

    Supported by NIH/NSF Ecology of Infectious Disease Program


Epidemiology of chagas disease in northern argentina

Argentina

Tintina

Departamento

Moreno

Eco-Epidemiology of Chagas’ Disease

In Northwest Argentina – study area

Ikonos satellite image –

used for detailed mapping

Departamento

Moreno

Santiago del Estero

Province

Amama

Dry Chaco - Semi-arid area; mean annual temp. of 22º C;

hot summers and cold winter nights


Landscape and community undergoing rapid change

Landscape and community undergoing rapid change

Local economy is based on exploitation of the (rapidly disappearing) forest: Wood-chopping, production of coal and hardwood posts.


Chagas study specific aims

Chagas study - Specific Aims

  • Analyze spatial & temporal pattern of reinfestation by triatomine bugs and T. cruzi infection in bugs, dogs and people

  • Identify mechanisms underlying these patterns

  • Determine source of colonizing vectors and of T. cruzi infection using morphometrics and molecular analyses

  • Develop empirically based, spatially structured mathematical models of reinfestation and transmission

  • Develop risk maps at village, Department and Province-wide levels


Chagas study components

Chagas study - Components

  • Field – vector, reservoir, domestic and human hosts, domestic, peridomestic and sylvatic environment

  • Laboratory – diagnosis, genetic variability of pathogen and vector, experimental studies

  • Computer – data management and analysis, predictions


Chagas study components1

Chagas study - Components

  • Field studies – parasitology, entomology, demography, epidemiology, spatial description and mapping, field experiments

  • Laboratory – diagnostic, morphometric, molecular, experimental

  • Computer – database, remote sensing, GIS, spatial statistics, modeling


Tasks in our 5 year study

Tasks in our 5-year study

  • create a georeferenced databaseto the structure level

  • measure infestation patterns in domestic, peridomestic and sylvatic habitats

  • study the population structure of bugs and trypanosomes

  • Determine infections rates in domestic and sylvatic animals

  • Understand and model the reinfestation process and transmission dynamics


Ikonos

1-m Panchromatic

4-m multi-spectral

IKONOS

The IKONOS satellite is a high resolution satellite capable of creating 1-m2 panchromatic and 4-m2 multi-spectral images.


Epidemiology of chagas disease in northern argentina

The First Step:

Getting the GPS points and making the Sketch maps

in the field.


Epidemiology of chagas disease in northern argentina

red

Green

Second Step:

Get the IKONOS and process it.

Blue

NIR

Pan

Stitch-Mosaic

together tiles

Combine

5 bands

Crop out smaller

Images for areas

Of interest


Epidemiology of chagas disease in northern argentina

Third Step:

Georeferencing the image with GPS points


Epidemiology of chagas disease in northern argentina

1- Bring in your GPS Points

2- Locate where they should overlay on the image


Epidemiology of chagas disease in northern argentina

The Image moves to match the points


Epidemiology of chagas disease in northern argentina

Now that the image is Georeferenced, we can digitize the structures.


Epidemiology of chagas disease in northern argentina

And end up with a comprehensive map

And location data for further analyses


Epidemiology of chagas disease in northern argentina1

Epidemiology of Chagas disease in Northern Argentina


Epidemiology of chagas disease in northern argentina

Skunk

Rodents processing

Opposum

Project is a true collaboration

between UBA, UIUC, CDC,

Rockefeller and

Nat’l Vector Control Programme;

and includes a strong training component

Armadillo


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