scholarly journals LIMITED DIVERSITY OF ANOPHELES DARLINGI IN THE PERUVIAN AMAZON REGION OF IQUITOS

2006 ◽  
Vol 75 (2) ◽  
pp. 238-245 ◽  
Author(s):  
VIVIANA PINEDO-CANCINO ◽  
WILLIAM E. OSWALD ◽  
JONATHAN A. PATZ ◽  
EDUARDO TARAZONA-SANTOS ◽  
AMY YOMIKO VITTOR ◽  
...  
Keyword(s):  
Amazon Region ◽  
Anopheles Darlingi ◽  
Peruvian Amazon

scholarly journals Intrapopulational genetic differentiation in Anopheles (N.) darlingi Root, 1926 (Diptera: Culicidae) in the amazon region

1999 ◽  
Vol 22 (3) ◽  
pp. 325-331 ◽  
Author(s):  
Joselita Maria Mendes dos Santos ◽  
Jorge Arturo Lobo ◽  
Wanderli Pedro Tadei ◽  
Eucleia P. Betioli Contel
Keyword(s):  
Genetic Differentiation ◽  
Central Region ◽  
Amazon Basin ◽  
Amazon Region ◽  
Anopheles Darlingi ◽  
Chromosomal Variation ◽  
Geographical Differentiation ◽  
Marginal Populations ◽  
Polymorphic Loci

Four natural Amazonian Anopheles darlingi populations were analyzed for 19 loci, 12 of which showed variation, i.e., 68.4% of polymorphic loci. The Ariquemes, Rondônia, population was the most variable, with a large number of alleles per locus (2.26 ± 0.27) and high polymorphism (P = 63.15). The highest values of observed and expected intralocus heterozygosity were observed in the Manaus, Amazonas, population (Ho = 0.432 ± 0.11; He = 0.375 ± 0.08), and the lowest in the Cachoeira Porteira, Pará, population (Ho = 0.236 ± 0.09; He = 0.290 ± 0.11). Wright's F-statistic revealed disequilibrium caused by an excess of homozygotes, as shown by the Fis > Fst values (Fis = 0.083 > 0.026) reflecting intrapopulational differentiation. The four populations studied were genetically similar, as indicated by distance and similarity values. Chromosomal variation of Amazon population also did not indicate geographical differentiation, and populations in the central region of the Amazon Basin showed high polymorphism in relation to the marginal populations, which were mainly monomorphic.

scholarly journals An unidentified cluster of infection in the Peruvian Amazon region

2015 ◽  
Vol 9 (05) ◽  
pp. 524-529 ◽  
Author(s):  
Angela Cornejo ◽  
Claudia Gomes ◽  
Luis Suarez ◽  
Sandra Martinez-Puchol ◽  
Pershing Bustamante ◽  
...  
Keyword(s):  
Amazon Region ◽  
Molecular Techniques ◽  
Rrna Gene ◽  
Peruvian Amazon ◽  
Molecular Tools ◽  
Bartonella Bacilliformis ◽  
Low Socioeconomic ◽  
Clinical Criteria ◽  
Infection Source ◽  
Additional Water

Introduction: Bartonella bacilliformis is the etiological agent of Carrion’s disease, which is a neglected disease linked to people in low-socioeconomic populations in Andean valleys. An outbreak of B. bacilliformis was reported in a rural area of the Peruvian Amazon region. The aim of this study was to characterize this outbreak using molecular techniques. Methodology: Fifty-three blood samples from patients diagnosed with Carrion’s disease were analyzed by molecular tools, using both a Bartonella-specific polymerase chain reaction (PCR) and an universal PCR, both based on 16S rRNA gene amplification. Additional water samples from the area were also analyzed. Results: Unexpectedly, the samples were positive only when the universal PCR was used. Although environmental contamination cannot be ruled out, the results showed that Sphingomonas faeni was the possible causative agent of this outbreak, and that water was the most feasible infection source. Conclusions: Diagnosis by clinical criteria or microscopy may lead to misdiagnosis. There is a need to include molecular tools in the routine diagnosis of febrile syndromes, including Carrion’s disease.

scholarly journals Decline in Sulfadoxine-Pyrimethamine-Resistant Alleles after Change in Drug Policy in the Amazon Region of Peru

2007 ◽  
Vol 52 (2) ◽  
pp. 739-741 ◽  
Author(s):  
Zhiyong Zhou ◽  
Sean M. Griffing ◽  
Alexandre Macedo de Oliveira ◽  
Andrea M. McCollum ◽  
Wilmer Marquino Quezada ◽  
...  
Keyword(s):  
Plasmodium Falciparum ◽  
Drug Policy ◽  
Amazon Basin ◽  
Microsatellite Analysis ◽  
Amazon Region ◽  
Common Origin ◽  
Line Treatment ◽  
Peruvian Amazon ◽  
First Line ◽  
First Line Treatment

ABSTRACT The frequency of alleles with triple mutations conferring sulfadoxine-pyrimethamine (SP) resistance in the Peruvian Amazon Basin has declined (16.9% for dhfr and 0% for dhps compared to 47% for both alleles in 1997) 5 years after SP was replaced as the first-line treatment for Plasmodium falciparum malaria. Microsatellite analysis showed that the dhfr and dhps alleles are of common origin.

scholarly journals Establishment of a free-mating, long-standing and highly productive laboratory colony of Anopheles darlingi from the Peruvian Amazon

2015 ◽  
Vol 14 (1) ◽  
Author(s):  
Cuauhtémoc Villarreal-Treviño ◽  
Gissella M Vásquez ◽  
Victor M López-Sifuentes ◽  
Karin Escobedo-Vargas ◽  
Anibal Huayanay-Repetto ◽  
...  
Keyword(s):  
Anopheles Darlingi ◽  
Peruvian Amazon ◽  
Laboratory Colony

scholarly journals Anopheline species, some of their habits and relation to malaria in endemic areas of Rondônia State, Amazon region of Brazil

1989 ◽  
Vol 84 (4) ◽  
pp. 501-514 ◽  
Author(s):  
Ricardo Lourenço-de-Oliveira ◽  
Anthony Erico da Gama Guimarães ◽  
Monique Arlé ◽  
Tereza Fernandes da Silva ◽  
Márcia Gonçalves Castro ◽  
...  
Keyword(s):  
Dominant Species ◽  
Brazilian Amazon ◽  
Amazon Region ◽  
Malaria Vectors ◽  
Anopheles Darlingi ◽  
Anopheline Species ◽  
Local Vector ◽  
Endemic Areas

In view of recent studies incriminating several species of anophelines, besides Anopheles darlingi, as malaria vectors in the Brazilian Amazon, we performed an anopheline survey in four localities - Ariquemes, Cujubim, Machadinho and Itapoã do Oeste - in Rondônia, the most malarious State in the Country. Twenty species were found. An. darlingi was, by far, the dominant species and the only one whose density coincided with that of malaria. On human baits it was more numerous in the immediate vincinity of houses than indoors whre, however, it was almost the only species encountered. On both situations it fed mostly at sunset and during the first half of the night. It was less numerous far from houses and scarce inside the forest. Other species (An. triannulatus, An. evansae, An. albitarsis, An. strodei) appeared in appreciable numbers only in Ariquemes, both in areas with and without malaria. The remaining species were scanty. An. darlingi was confirmed as the primary local vector.

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