INVESTIGADORES
SCHIJMAN Alejandro Gabriel
artículos
Título:
Long-term reduction of Trypanosoma cruzi infection in sylvatic mammals following deforestation and sustained vector surveillance in northwestern Argentina
Autor/es:
CEBALLOS LA, CARDINAL MV, VAZQUEZ-PROKOPEC GM, LAURICELLA MA, OROZCO MM, CORTINAS R, SCHIJMAN AG, LEVIN MJ, KITRON U, GÜRTLER RE
Revista:
ACTA TROPICA
Referencias:
Año: 2006 vol. 98 p. 286 - 296
ISSN:
0001-706X
Resumen:
Abstract
Long-term variations in the dynamics and intensity of sylvatic transmission of Trypanosoma cruzi were investigated around eight
rural villages in the semiarid Argentine Chaco in 20022004 and compared to data collected locally in 19841991. Of 501 wild
mammals from 13 identified species examined by xenodiagnosis, only 3 (7.9%) of 38 Didelphis albiventris opossums and 1 (1.1%)
of 91 Conepatus chinga skunks were infected by T. cruzi. The period prevalence in opossums was four-fold lower in 20022004
than in 19841991 (3236%). The infection prevalence of skunks also decreased five-fold from 4.15.6% in 19841991 to 1.1%
in 20022004. Infection in opossums increased with age and from summer to spring in both study periods. The force of infection
per 100 opossum-months after weaning declined more than six-fold from 8.2 in 19881991 to 1.2 in 20022004. Opossums were
mainly infected by T. cruzi lineage I and secondarily by lineage IId in 19841991, and only by T. cruzi I in 20022004; skunks
were infected by T. cruzi IId in 19841991 and by IIc in 20022004. The striking decline of T. cruzi infection in opossums and
skunks occurred in parallel to community-wide insecticide spraying followed by selective sprays leading to very low densities of
infected Triatoma infestans in domestic and peridomestic habitats since 1992; to massive deforestation around one of the villages
or selective extraction of older trees, and apparent reductions in opossum abundance jointly with increases in foxes and skunks.
These factors may underlie the dramatic decrease of T. cruzi infection in wild reservoir hosts.
© 2006 Elsevier B.V. All rights reserved.Trypanosoma cruzi were investigated around eight
rural villages in the semiarid Argentine Chaco in 20022004 and compared to data collected locally in 19841991. Of 501 wild
mammals from 13 identified species examined by xenodiagnosis, only 3 (7.9%) of 38 Didelphis albiventris opossums and 1 (1.1%)
of 91 Conepatus chinga skunks were infected by T. cruzi. The period prevalence in opossums was four-fold lower in 20022004
than in 19841991 (3236%). The infection prevalence of skunks also decreased five-fold from 4.15.6% in 19841991 to 1.1%
in 20022004. Infection in opossums increased with age and from summer to spring in both study periods. The force of infection
per 100 opossum-months after weaning declined more than six-fold from 8.2 in 19881991 to 1.2 in 20022004. Opossums were
mainly infected by T. cruzi lineage I and secondarily by lineage IId in 19841991, and only by T. cruzi I in 20022004; skunks
were infected by T. cruzi IId in 19841991 and by IIc in 20022004. The striking decline of T. cruzi infection in opossums and
skunks occurred in parallel to community-wide insecticide spraying followed by selective sprays leading to very low densities of
infected Triatoma infestans in domestic and peridomestic habitats since 1992; to massive deforestation around one of the villages
or selective extraction of older trees, and apparent reductions in opossum abundance jointly with increases in foxes and skunks.
These factors may underlie the dramatic decrease of T. cruzi infection in wild reservoir hosts.
© 2006 Elsevier B.V. All rights reserved.Didelphis albiventris opossums and 1 (1.1%)
of 91 Conepatus chinga skunks were infected by T. cruzi. The period prevalence in opossums was four-fold lower in 20022004
than in 19841991 (3236%). The infection prevalence of skunks also decreased five-fold from 4.15.6% in 19841991 to 1.1%
in 20022004. Infection in opossums increased with age and from summer to spring in both study periods. The force of infection
per 100 opossum-months after weaning declined more than six-fold from 8.2 in 19881991 to 1.2 in 20022004. Opossums were
mainly infected by T. cruzi lineage I and secondarily by lineage IId in 19841991, and only by T. cruzi I in 20022004; skunks
were infected by T. cruzi IId in 19841991 and by IIc in 20022004. The striking decline of T. cruzi infection in opossums and
skunks occurred in parallel to community-wide insecticide spraying followed by selective sprays leading to very low densities of
infected Triatoma infestans in domestic and peridomestic habitats since 1992; to massive deforestation around one of the villages
or selective extraction of older trees, and apparent reductions in opossum abundance jointly with increases in foxes and skunks.
These factors may underlie the dramatic decrease of T. cruzi infection in wild reservoir hosts.
© 2006 Elsevier B.V. All rights reserved.Conepatus chinga skunks were infected by T. cruzi. The period prevalence in opossums was four-fold lower in 20022004
than in 19841991 (3236%). The infection prevalence of skunks also decreased five-fold from 4.15.6% in 19841991 to 1.1%
in 20022004. Infection in opossums increased with age and from summer to spring in both study periods. The force of infection
per 100 opossum-months after weaning declined more than six-fold from 8.2 in 19881991 to 1.2 in 20022004. Opossums were
mainly infected by T. cruzi lineage I and secondarily by lineage IId in 19841991, and only by T. cruzi I in 20022004; skunks
were infected by T. cruzi IId in 19841991 and by IIc in 20022004. The striking decline of T. cruzi infection in opossums and
skunks occurred in parallel to community-wide insecticide spraying followed by selective sprays leading to very low densities of
infected Triatoma infestans in domestic and peridomestic habitats since 1992; to massive deforestation around one of the villages
or selective extraction of older trees, and apparent reductions in opossum abundance jointly with increases in foxes and skunks.
These factors may underlie the dramatic decrease of T. cruzi infection in wild reservoir hosts.
© 2006 Elsevier B.V. All rights reserved.T. cruzi lineage I and secondarily by lineage IId in 19841991, and only by T. cruzi I in 20022004; skunks
were infected by T. cruzi IId in 19841991 and by IIc in 20022004. The striking decline of T. cruzi infection in opossums and
skunks occurred in parallel to community-wide insecticide spraying followed by selective sprays leading to very low densities of
infected Triatoma infestans in domestic and peridomestic habitats since 1992; to massive deforestation around one of the villages
or selective extraction of older trees, and apparent reductions in opossum abundance jointly with increases in foxes and skunks.
These factors may underlie the dramatic decrease of T. cruzi infection in wild reservoir hosts.
© 2006 Elsevier B.V. All rights reserved.T. cruzi IId in 19841991 and by IIc in 20022004. The striking decline of T. cruzi infection in opossums and
skunks occurred in parallel to community-wide insecticide spraying followed by selective sprays leading to very low densities of
infected Triatoma infestans in domestic and peridomestic habitats since 1992; to massive deforestation around one of the villages
or selective extraction of older trees, and apparent reductions in opossum abundance jointly with increases in foxes and skunks.
These factors may underlie the dramatic decrease of T. cruzi infection in wild reservoir hosts.
© 2006 Elsevier B.V. All rights reserved.Triatoma infestans in domestic and peridomestic habitats since 1992; to massive deforestation around one of the villages
or selective extraction of older trees, and apparent reductions in opossum abundance jointly with increases in foxes and skunks.
These factors may underlie the dramatic decrease of T. cruzi infection in wild reservoir hosts.
© 2006 Elsevier B.V. All rights reserved.T. cruzi infection in wild reservoir hosts.
© 2006 Elsevier B.V. All rights reserved.