Volume 49, Issue 2
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



A two-year field study of Andean cutaneous leishmaniasis (uta) in the valley of Purisima, Ancash Department, Peru has provided quantitative epidemiologic and entomologic evidence for the predominant role of in the transmission of in this endemic area. The monthly incidence in the valley was greatest in the wet season (from December to May), when was particularly endophilic. A significant correlation was detected between intradomiciliary (but not extradomiciliary) abundance and the monthly incidence of uta in the valley following a one-month time lag. In contrast, no significant correlation was detected between any measure of abundance and the incidence of uta. and comprise more than 98% of all the sand fly captures made in this valley. The increase in incidence of uta with altitude, which reached a peak rate between 2,250 and 2,750 meters above sea level, was associated with an increase in the relative abundance of as compared with . Seasonal and altitudinal variation was also detected in the peak time of activity for both sand fly species, a phenomenon that could significantly influence the transmission rate: later host-seeking sand flies being more likely to find sleeping, nondefensive, human hosts.


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