INVESTIGADORES
PICOLLO Maria Ines
artículos
Título:
Evidence of pyrethroid resistance in eggs of Pediculus humanus capitis (Anoplura: Pediculidae) from Argentine
Autor/es:
MOUGABURE CUETO G., E. ZERBA & M. I. PICOLLO
Revista:
J Med Entomol
Editorial:
Entomological Society of America
Referencias:
Lugar: Lanhan, Maryland; Año: 2008 vol. 45 p. 693 - 697
Resumen:
ABSTRACT Insecticide resistance in Pediculus humanus capitis De Geer 1778 (Phthiraptera: Pediculidae)
from different countries has been well documented in the last years. Otherwise, little
research has been reported about insecticide resistance in insect embryos and none in human louse
embryos. In this work, we studied insecticide resistance in eggs of three head lice populations whose
pyrethroid resistance was shown in adults and nymphs compared with a susceptible laboratory body
louse strain. All head louse populations showed high permethrin resistance in eggs. Levels of permethrin
resistance (LCRs) assessed in eggs by immersion technique were higher than those previously
reported for the corresponding populations of adults by topical application. Comparison ofLCRvalues
for different populations showed that there was a direct relationship between the resistance levels
assessed in eggs and those in adults. All permethrin-resistant eggs showed high resistance to dphenothrin
and dichloro-diphenyl-trichloroethane (DDT) and low resistance to carbaryl, which is in
commonwith the resistance proÞle established for adults and nymphs. The results concerning the high
resistance to pyrethroid (permethrin and d-phenothrin) and the cross-resistance toDDTand carbaryl
detected in head louse eggs and adults suggested similar resistance mechanisms in eggs and adults of
head louse populations from adults.
from different countries has been well documented in the last years. Otherwise, little
research has been reported about insecticide resistance in insect embryos and none in human louse
embryos. In this work, we studied insecticide resistance in eggs of three head lice populations whose
pyrethroid resistance was shown in adults and nymphs compared with a susceptible laboratory body
louse strain. All head louse populations showed high permethrin resistance in eggs. Levels of permethrin
resistance (LCRs) assessed in eggs by immersion technique were higher than those previously
reported for the corresponding populations of adults by topical application. Comparison ofLCRvalues
for different populations showed that there was a direct relationship between the resistance levels
assessed in eggs and those in adults. All permethrin-resistant eggs showed high resistance to dphenothrin
and dichloro-diphenyl-trichloroethane (DDT) and low resistance to carbaryl, which is in
commonwith the resistance proÞle established for adults and nymphs. The results concerning the high
resistance to pyrethroid (permethrin and d-phenothrin) and the cross-resistance toDDTand carbaryl
detected in head louse eggs and adults suggested similar resistance mechanisms in eggs and adults of
head louse populations from adults.
from different countries has been well documented in the last years. Otherwise, little
research has been reported about insecticide resistance in insect embryos and none in human louse
embryos. In this work, we studied insecticide resistance in eggs of three head lice populations whose
pyrethroid resistance was shown in adults and nymphs compared with a susceptible laboratory body
louse strain. All head louse populations showed high permethrin resistance in eggs. Levels of permethrin
resistance (LCRs) assessed in eggs by immersion technique were higher than those previously
reported for the corresponding populations of adults by topical application. Comparison ofLCRvalues
for different populations showed that there was a direct relationship between the resistance levels
assessed in eggs and those in adults. All permethrin-resistant eggs showed high resistance to dphenothrin
and dichloro-diphenyl-trichloroethane (DDT) and low resistance to carbaryl, which is in
commonwith the resistance proÞle established for adults and nymphs. The results concerning the high
resistance to pyrethroid (permethrin and d-phenothrin) and the cross-resistance toDDTand carbaryl
detected in head louse eggs and adults suggested similar resistance mechanisms in eggs and adults of
head louse populations from adults.
Insecticide resistance in Pediculus humanus capitis De Geer 1778 (Phthiraptera: Pediculidae)
from different countries has been well documented in the last years. Otherwise, little
research has been reported about insecticide resistance in insect embryos and none in human louse
embryos. In this work, we studied insecticide resistance in eggs of three head lice populations whose
pyrethroid resistance was shown in adults and nymphs compared with a susceptible laboratory body
louse strain. All head louse populations showed high permethrin resistance in eggs. Levels of permethrin
resistance (LCRs) assessed in eggs by immersion technique were higher than those previously
reported for the corresponding populations of adults by topical application. Comparison ofLCRvalues
for different populations showed that there was a direct relationship between the resistance levels
assessed in eggs and those in adults. All permethrin-resistant eggs showed high resistance to dphenothrin
and dichloro-diphenyl-trichloroethane (DDT) and low resistance to carbaryl, which is in
commonwith the resistance proÞle established for adults and nymphs. The results concerning the high
resistance to pyrethroid (permethrin and d-phenothrin) and the cross-resistance toDDTand carbaryl
detected in head louse eggs and adults suggested similar resistance mechanisms in eggs and adults of
head louse populations from adults.
KEY WORDS head lice, resistance, insecticide, eggs, pyrethroidshead lice, resistance, insecticide, eggs, pyrethroids