INVESTIGADORES
TOLOZA Ariel Ceferino
artículos
Título:
SCIENTIFIC EVIDENCE OF THREE DIFFERENT INSECTICIDE-RESISTANT PROFILES IN TRIATOMA INFESTANS (HEMIPTERA: REDUVIIDAE) POPULATIONS FROM ARGENTINA AND BOLIVIA
Autor/es:
M. D. GERMANO; P. SANTO-ORIHUELA; G. ROCA-ACEVEDO; A. C. TOLOZA; C. VASSENA; M. I. PICOLLO; G. MOUGABURE-CUETO
Revista:
JOURNAL OF MEDICAL ENTOMOLOGY
Editorial:
ENTOMOLOGICAL SOC AMER
Referencias:
Lugar: Lanham; Año: 2012 vol. 49 p. 1355 - 1360
ISSN:
0022-2585
Resumen:
Triatoma infestans (Klug, 1834) (Hemiptera, Reduviidae) is the
main vector of Chagas disease in the southern cone South America. Chemical
control to the vectors appears to be the best option to reduce the incidence of
the disease. However, since 2002, high resistance to insecticides that correlated
with Þeld control failures was detected in T. infestans from Argentina
and Bolivia. In this paper, we analyzed three T. infestans populations
whose pyrethroid-resistance had been recently detected, andwedeÞned at least
three resistant proÞles according to the toxicological and biochemical characteristics
of the studied resistant populations. The resistance proÞles were identiÞed as
Ti-R1, Ti-R2, and Ti-R3, corresponding to the Argentinean Acambuco, and the
Bolivians Entre Rõ´os and
Mataral. Ti-R1 exhibited nymphs and eggs with
medium resistance level to deltamethrin (RR _ 32.5 and 28.6; respectively).
Pyrethroid-esterases played a relevant role in deltamethrin resistance. Ti-R2 exhibited
nymphs with high resistance to deltamethrin (RR _ 173.8) and low resistance to Fipronil
(RR _ 12.4). Pyrethroid-esterases were involved in resistance. Moreover, eggs
showed medium resistance level to deltamethrin (RR _ 39.1). Ti-R3 had nymphs
with low resistance to deltamethrin (RR _ 17.4), and medium resistance to
Þpronil (RR _ 66.8). Pyrethroid-esterases showed increased activity, and eggs
possessed low resistance to deltamethrin (RR _ 8.4). The characterization of the
resistance to pyrethroid in these T. infestans populations from
Argentina and Bolivia do not permit the
generalization of three forms of resistance
proÞle. So far as we appear to know, the forms of
mechanisms and their frequencies reported here
are selected independently, so additional sites might well show additional
combinations of resistance mechanisms and their frequencies.