Six species are recorded for the 1st time in Formosa province, northeast region of Argentina: Culex delpontei, Cx. eduardoi, Cx. maxi, [corrected] and Toxorhynchites theobaldi, increasing the number of species of that province to 73.
Seven mosquito species are recorded for the 1st time for northeastern Argentina: Culex (Melanoconion) albinensis, Cx. (Mel.) elevator, Cx. (Mel.) intrincatus, and Cx. (Mel.) serratimarge for Formosa Province, and Sabethes (Peytonulus) undosus, Sa. (Sabethinus) melanoninphe, and Toxorhynchites (Lynchiella) theobaldi for Chaco Province. The geographical distribution of these species is extended to northeastern Argentina, and the number of species increases to 97 and 75 for the provinces of Chaco and Formosa, respectively.
The usefulness of the direct agglutination test (DA) to diagnose Mal de Caderas disease was evaluated. Forty four sera samples from two lots of horses with natural T. evansi infection (Lot 1 and Lot 2) were used. Thirteen (81.2%) of sixteen horses in which parasites were isolated gave positive agglutination titres (> or = 1:512) in the DA test. Treatment of these positive sera with 2-mercaptoethanol drops three to eight dilutions the agglutination titres in twelve samples (92%), showing the IgM nature of these antibodies. The DA test was also positive in seventeen of twenty eight horses in which parasites could not be detected. Five T. evansi infected horses, Lot three, which had high antibodies levels in the DA test, were treated with Naganol (Bayer-Germany). In four animals these antibodies were mainly IgM. In agreement with negative control for parasites, two months after treatment, IgM could not be detected while IgG antibodies remained detectable in low titres 12 months in three of the five horses. Fifty control horses sera from a T. evansi free area were AD negative. The DA and DA+2-ME are recommended as a routine method to diagnose Mal de Caderas disease in combination with parasitological diagnostic methods.
Resumen
Una gran diversidad de especies ha sido descripta como miembros de la familia Culicidae. Ampliamente distribuidas por todo el mundo es reconocida su importancia, como vectores de diversas enfermedades. En la región del Nordeste Argentino se han producido aportes sistemáticos basados en las características de sus hábitats y la preferencia de sus hospedadores. En la provincia de Formosa se han citado solo 63 especies en contraste con los 94 citadas para la provincia del Chaco y 189 para la provincia de Misiones.
El presente trabajo basó su estudio en la composición, abundancia y diversidad de la población de culícidos en el departamento Formosa.
Abstract
A great diversity of species has been described as members of the family Culicidae. They are widely distributed all over the world and their importance as vectors of several diseases is well known. In the Northeastern region of Argentina, systematic contributions have been made based on their habitat characteristics and host preference. In the province of Formosa only 63 species have been cited in contrast to the 94 cited for the province of Chaco and 189 for the province of Misiones.
The present work was based on the composition, abundance and diversity of the culicidae population in the department of Formosa.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.