INVESTIGADORES
VASSENA Claudia Viviana
artículos
Título:
Prevalence and Levels of Permethrin Resistance in Pediculus humanus capitis De Geer (Anoplura: Pediculidae) from Buenos Aires, Argentina
Autor/es:
C. V. VASSENA, G. MOUGABURE CUETO, P. GONZÁLEZ AUDINO, R. A. ALZOGARAY, E. N. ZERBA AND M. I. PICOLLO1
Revista:
JOURNAL OF MEDICAL ENTOMOLOGY
Editorial:
ENTOMOLOGICAL SOC AMER
Referencias:
Año: 2003 p. 447 - 450
ISSN:
0022-2585
Resumen:
ABSTRACT Permethrin has been used extensively for control of PediculWi humanus capitis De Geer
(Anoplura: Pediculidae) in Argentina since 1990, resulting in the development of resistance to this and
other pyrethroids, This resistance was first detected in some field populations in 1997. A survey for
resistance in Buenos Aires in 2001 revealed significant resistance levels in lice on children at 24 of 26
(92.3%) schools. When compared with a previously unexposed reference population, resistance ratios
(RRs) obtained by exposing the insects to filter papers impregnated with permethrin ranged from 2
to 60 in 10 (39%) of the schools. RRs in the remaining 14 (61%) populations were too great to not be
(Anoplura: Pediculidae) in Argentina since 1990, resulting in the development of resistance to this and
other pyrethroids, This resistance was first detected in some field populations in 1997. A survey for
resistance in Buenos Aires in 2001 revealed significant resistance levels in lice on children at 24 of 26
(92.3%) schools. When compared with a previously unexposed reference population, resistance ratios
(RRs) obtained by exposing the insects to filter papers impregnated with permethrin ranged from 2
to 60 in 10 (39%) of the schools. RRs in the remaining 14 (61%) populations were too great to not be
(Anoplura: Pediculidae) in Argentina since 1990, resulting in the development of resistance to this and
other pyrethroids, This resistance was first detected in some field populations in 1997. A survey for
resistance in Buenos Aires in 2001 revealed significant resistance levels in lice on children at 24 of 26
(92.3%) schools. When compared with a previously unexposed reference population, resistance ratios
(RRs) obtained by exposing the insects to filter papers impregnated with permethrin ranged from 2
to 60 in 10 (39%) of the schools. RRs in the remaining 14 (61%) populations were too great to not be
PediculWi humanus capitis De Geer
(Anoplura: Pediculidae) in Argentina since 1990, resulting in the development of resistance to this and
other pyrethroids, This resistance was first detected in some field populations in 1997. A survey for
resistance in Buenos Aires in 2001 revealed significant resistance levels in lice on children at 24 of 26
(92.3%) schools. When compared with a previously unexposed reference population, resistance ratios
(RRs) obtained by exposing the insects to filter papers impregnated with permethrin ranged from 2
to 60 in 10 (39%) of the schools. RRs in the remaining 14 (61%) populations were too great to not be(39%) of the schools. RRs in the remaining 14 (61%) populations were too great to not be
measured with the filter paper method (RR > 88.7). As an altemative, we used topical applications
of 0.1 p.l of acetone solution of permethrin on the dorsal abdomen of adults and third instars. This
topical method, which has not be en previously reported for head lice, was capable of quantifying
higher levels of resistance. Highly resistant populations had RRs from 162.5 to 655.2. When applied
to populations with low and intermediate levels of resistance, results from the filter paper and topical
application methods were highly correlated, and RRs from topical application were higher than those
from the filter paper method. Results from the combination of the two methods indicated that head
lice among Buenos Aries school children are highly resistant to permethrin, and the resistance is
widespread.
KEY WORDS PediculWi humanWi capitis, permethrin resistance, bioassayPediculWi humanWi capitis, permethrin resistance, bioassay