This study describes the parasitic fauna of Mylossoma duriventre caught at Lake Coari, a tributary of the middle Solimões River, in the state of Amazonas (central Amazon, Brazil) and the relative condition factor (Kn). Out of 70 necropsied specimens, 90% had the gills parasitized by the helminth Anacanthorus paraspathulatus Kritsky, Boeger & Van Every, 1992 (Dactylogyridae: Anacanthorinae) and the intestine by Eustrongylides Jägerskiöld 1909 (Nematoda: Dioctophymatidae) larvae. Atotal of 19,763 specimens of A. paraspathulatus were collected, but the infection by Eustrongylides sp. larvae seemed to be accidental, only three hosts were trophically infected. However, there was no significant difference (p<0.05) in the Kn of parasitized and nonparasitized fish, indicating that the intensity these parasites has not affected the health of the host. This is the first report of parasit...

Toxocariasis is a human infection caused by the larvae of the nematodes Toxocara canis (Werner, 1782) or Toxocara cati (Schrank, 1788), which are parasitic in animals, and represents a serious public health problem. The objective of this study was to investigate the information and prevalence of parasitic toxocariasis in the state of Sucre, Venezuela, particularly in the municipalities of Montes and Sucre, in communities considered vulnerable due to social and economic deficiencies within the epidemiological/sanitary monitoring. In these municipalities, there are many stray dogs living near homes and maintaining contact with other domestic dogs. The seroprevalence of T. canis was evaluated through the ELISA method. A seroprevalence of IgG anti-T. canis was obtained in the parish of San Juan of 90.12% and in the parish of Cumanacoa of 82.14%. In the parish of San Juan, when evaluating the...