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vol.8 número1-4Estudios sobre leishmaniasis tegumentaria en el Perú: V. Leishmaniasis natural en perros procedentes de localidades utógenas índice de autoresíndice de materiabúsqueda de artículos
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Revista Peruana de Medicina Experimental y Salud Publica

versión impresa ISSN 1726-4634


HERRER, Arístides. Estudios sobre leishmaniasis tegumentaria en el Perú: IV. Observaciones epidemiológicas sobre la uta. Rev. perú. med. exp. salud publica [online]. 1951, vol.8, n.1-4, pp.45-86. ISSN 1726-4634.

Observations carried out during 1943 through 1949 in the utogenous zone of the Huarochiri province, Perú, allow the following statements on the epidemiological aspects of uta. 1. Huarochirí province utogenous zone extends from 1,200 to 3,000 meters (3,936 to 9,840 feet) above sea level. Between these limits incidence varies in such a way that its graphical representation follows a normal curve of distribution, being the peak of endemicity located between 1,800 and 2,400 meters (5,905 and 7,874 feet) of altitude. 2. Beside altitude, the inciense of utogenous localities is chiefly determined by their relationship to rural areas, as in the case with skin leishmaniasis through others southamerican countries. However, it is well to be kept in mind the fact that there where uta is endemic no true jungle is to be found, being a quite unique epidemiological characteristic of such clinical form of cuatanoeus leishmaniasis in Perú. 3. As far as the lesions importance and localization, it could be said that some differences exist between uta and the selvatic form or so-called espundia. Usually in uta all lesions are of benign nature being very small the percentage of cases with involvement of the mucous membranes. Morever, the cutaneous lesions are preferently localized on the face. lt was also possible to determine some relachionship existing between the number of lesions per individual and locality endemicity. Thus, cases with three or more lesions are much more frequent in localities of high incidence. 4. Twice it was possible to verify the existence of reinfection in individuals that after several years of residence in the place where they were first infected moved to another utogenous locality; that which suggests the absence of cross-inmunity among certain strains. 5. The incubation period has been determined in several human cases of natural infection ranging from one to three and a falf months. This incubation period is readily comparable to the one observed in a human case of experimental infection, as well as to those corresponding to experimental infections in dogs and foxes. 6. The relation of uta incience to seasonal changes during the year seems to be conditioned by the system of rains, being higher (the incidence) with prolonged and intense rainfalls. Between December and March it rains in the utogenous zones, that is to say, during summer in the southern hemisphere. 7. There is practically no difference in uta incidence as far as sex is concerned, since the proportion of men and women suffer infection is approximately the same. As for age of greater frequency of infection it seems to bear a close relationship to the degree of local endemicity. The prevalent criterion that uta infection is much more frequent among children in their early years of life would hold true only for localities of high incidence.

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