Sand flies (Diptera: Psychodidae) are responsible for the transmission of protozoan parasites that cause leishmaniases. They are found predominantly in forests, but some species exploit environments that have been subject to deforestation and subsequent human colonization. Studies conducted in Brazil over the past 30 years show that some species are adapting to peri-urban and urban settings. We evaluated sand fly diversity and abundance in the rural settlement of Rio Pardo, Presidente Figueiredo Municipality, Amazonas State, Brazil. Settlement households were divided into four categories. These categories were determined by the human population density and the degree of deforestation in the immediate area. We used CDC light traps to sample the area surrounding 24 households (6 households in each category). Samples were taken on six occasions during September-November 2009 and June-August 2010. A total of 3074 sand fly specimens were collected, including 1163 females and 1911 males. These were classified into 13 genera and 52 species. The greatest abundance of sand flies and the greatest richness of species were observed in areas where human population density was highest. Our results show that changes in the human occupancy and vegetation management in rural settlements may affect the population dynamics and distribution of sand fly species, thereby affecting the local transmission of cutaneous leishmaniases.
INTRODUCTION: Mild symptoms of envenoming by Phoneutria spiders are local pain, erythema, and edema. Systemic manifestations are uncommon and sequelae have been rarely reported in literature. OBJECTIVE: To describe the case of a young woman bitten by a Phoneutria spider on middle toe of left foot. CASE REPORT: The evaluation was described as a case of moderate complication with Raynaud phenomenon sequelae. The bite site became darker and pain, swelling, and cold sensation persisted for several days along with numbness and desquamation. The clinical examination of the patient also indicated poor circulation on middle toe. After four months from the accident, the wound healed, but the patient experienced persistent pain, which radiated to plantar area, and insistent abnormal blood flow (Raynaud phenomenon) as sequelae. CONCLUSION: This study brings light to sequelae of phoneutrism rarely reported in literature.
Phlebotomine sand flies are insects of medical importance, as they are vectors of viruses, bacteria and trypanosomatids of the genus Leishmania Ross, the causative agent of leishmaniasis (Forattini 1973). During the past 20 years approximately 500,000 cases of leishmaniasis have been reported in Brazil. Most of these cases were reported in the North and Northeast regions. In the State of Roraima, almost 2,000 cases, including both cutaneous leishmaniasis (CL) and visceral leishmaniasis (VL), have been reported during the past three years (SINAN 2017). Usually the transmission by infected female sand flies occurs in wild or rural areas, but there have also been recorded cases and vector captures in urban environments. Some sand fly species are known to enter houses in search of resting places and blood meal sources; as a result of this behavior, they are remarkably adaptable to new environments (Carvalhoet al. 2010).
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