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Nous vous invitons à venir nombreux au prochain séminaire de MIVEGEC le jeudi 12 septembre 2019 à 11h00 dans l'amphithéâtre des plantes du centre IRD de Montpellier,

 

Prof Joel E COHEN (Rockerfeller University & Columbia University, New York, USA) nous fera une présentation intitulée ;

Chagas disease vector control and Taylor's law of fluctutation scaling

 

Résumé de la présentation :

 

Many major human vector-borne diseases, including Chagas disease, need improved vector control and elimination. Improved sampling designs and methods contribute to improved vector control and elimination by locating and estimating vector populations more efficiently. In recent work with Ricardo E. Gürtler, Universidad de Buenos Aires, we discovered a previously unnoticed pattern in the spatial distribution of the insect vectors of Chagas disease: the insects conform to Taylor’s law (TL). TL posits that the sample variance of population size is approximately a power function of the sample mean of population size in different samples. We showed that TL described remarkably well (adjusted R2 = 0.86-0.98) the counts of four insect vectors of Chagas disease (Triatoma infestans, T. guasayana, T. garciabesi and T. sordida) in 36,318 habitat searches in four diverse districts in the Argentine Chaco region, before and after various types of insecticide spraying. The exponents of the TL power law most often ranged from 1.50 to 1.75, consistent with significant spatial heterogeneity or insect aggregation. Predictions of new models of the effect of vector control measures on TL agreed with field data. TL identifies key habitats with highly heterogeneous infestation and provides a new tool for disease control and elimination programs.


Planning séminaires

 
L'équipe des séminaires

Fanni BORVETO

Flora GOUZERH

Bi Zamble Hubert ZAMBLE