ABSTRACT
Several species of Leishmania are responsible for leishmaniases in Thailand, although little is known about their transmission. Sergentomyia gemmea has been suspected several times to transmit Leishmania martiniquensis. Some captures carried out in Thailand and Lao People's Democratic Republic have emphasized the scarcity of Se. gemmea, comprising only 1% of the collected females. The sequencing of cytochrome B mtDNA of our specimens showed that our specimens are not grouped with other Se. gemmea previously deposited in GenBank. The latter are grouped with some Se. khawi and Se. hivernus that we processed in the present study. We suspect misidentifications and propose focusing on the most useful characters for identification of Se. gemmea based on the examination of type-specimens. The examination of the ascoids exhibiting anterior spurs is the most important one. However, we also describe Se. raynali n. sp. exhibiting comparable spurs but differing from Se. gemmea by its original cibarium. Finally, the vectorial role of Se. gemmea appears very questionable in the absence of new evidence.
Subject(s)
Insect Vectors/classification , Psychodidae/classification , Animals , Cytochromes b/analysis , DNA, Mitochondrial/analysis , Female , Insect Proteins/analysis , Insect Vectors/anatomy & histology , Insect Vectors/genetics , Laos , Male , Psychodidae/anatomy & histology , Psychodidae/genetics , Sequence Analysis, DNA , ThailandABSTRACT
Leishmaniasis is a neglected tropical parasitic disease affecting a large number of countries in the world. Early diagnosis of Leishmania infections is essential for therapeutic reasons, as it can decrease morbidity and mortality. L. siamensis and L. martiniquensis are novel Leishmania species recently described in Thailand and Myanmar. The disease is usually found in immunocompromised patients, especially those who have AIDS. Currently, the diagnosis of Leishmania infection in Thailand relies on microscopy, microbial culture, and polymerase chain reaction (PCR). In this study, we established a quantitative PCR (qPCR) method for detection of L. martiniquensis DNA in various types of clinical specimens, including whole blood, buffy coat, saliva, and urine of L. martiniquensis infected patients. The results of the qPCR assay were positive in all saliva samples. The assay is therefore effective to detect L. martiniquensis DNA even in noninvasive specimens, and it could be used for the diagnosis, follow up, and survey of L. martiniquensis infections.
