Spatial dynamics of urban populations of Lutzomyia longipalpis (Diptera: Psychodidae) in Caxias, State of Maranhão, Brazil

Maria do Desterro Soares Brandão Nascimento Maria Helena Silva Graça Maria de Castro Viana Francisco Santos Leonardo Geusa Felipa de Barros Bezerra Antonia Suely Guimarães e Silva Valéria Cristina Pinheiro Soares Silma Regina Ferreira Pereira José Manuel Macário Rebêlo Reginaldo Peçanha Brazil About the authors

Introduction

In this paper, we report the ecology of Lutzomyia longipalpis in Caxias City, located in the eastern part of State of Maranhão, Brazil and highlight its seasonal and geographical distribution by environment. In addition, we discuss natural Leishmania infection and its relationship with visceral leishmaniasis.

Methods

Between September 2007 and August 2009, the collection of sandflies was performed using Center for Disease Control (CDC) light traps from 15 houses in 5 selected neighborhoods.

Results

Lutzomyia longipalpis was present in all zones of the city. We also found that Lu. longipalpis was regularly detected both inside and around the house, predominantly in outdoor areas. In urban areas, Lu. longipalpis was present in both the dry and rainy seasons, with a higher density present in the latter. One female specimen of Lu. longipalpis was observed to have natural Leishmania infection.

Conclusions

The presence of Lu. longipalpis was observed throughout the year during 2 seasonal periods, with a predominance in the rainy season. A low rate of natural Leishmania infection was observed in urban areas during the rainy season.

Lutzomyia longipalpis ; Distribution; Natural infection; Urban areas; Maranhão


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