An analysis of reported cases of leishmaniasis in the southern Ecuadorian Amazon region, 1986-2012

Hector R. Olalla, Lenin N. Velez, Hirotomo Kato, Kazue Hashiguchi, Abraham G. Caceres, Eduardo A. Gomez, Flavio C. Zambrano, Daniel A. Romero-Álvarez, Angel G. Guevara, Yoshihisa Hashiguchi

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

An analysis of reported cases of cutaneous leishmaniasis (CL) was performed using the data registered in the southern Ecuadorian Amazon region during 27 years from 1986 to 2012. The cases/subjects with both the suspected CL lesions and the amastigote-positive results were recruited for the analysis. The yearly occurrence of cases showed a markedly higher number during the six years, 1988 and 1993. After 1994 when the insecticide spraying campaign using helicopter in 1993-1994, the number dropped remarkably. Then, the yearly occurrence gradually fluctuated from 101 cases in 1996 to 11 in 2009, maintaining a low number of cases after the campaign. The monthly occurrence of cases showed a markedly high number during March and August, suggesting a correlation to the rainy season (months) in the areas. A statistical significance was found between the monthly average number of the CL case and the average precipitation (. p=. 0.01474). It was suggested that the time of transmission of CL would depend on the rainy seasons at each endemic area of Ecuador, which has a diverse climatic feature depending on the geographic regions. Such information at given leishmaniasis-endemic areas of Ecuador would be important for the future planning of the disease control. Molecular analysis and characterization of clinical samples revealed the presence of Leishmania (. Viannia) braziliensis.

Original languageEnglish
Pages (from-to)119-126
Number of pages8
JournalActa Tropica
Volume146
DOIs
StatePublished - 1 Jun 2015

Bibliographical note

Funding Information:
This study was financially supported by the Ministry of Education, Culture and Sports, Science and Technology (MEXT) of Japan (Grant Nos. 23256002 and 25257501 ), and the Prometeo Project of the Secretaría Nacional de Educación Superior, Ciencia, Tecnología e Innovación (SENESCYT), Ecuador.

Publisher Copyright:
© 2015 Elsevier B.V.

Keywords

  • Cutaneous leishmaniasis
  • Reported cases
  • Retrospective analysis
  • Southern Ecuadorian Amazon region

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