# Occurrence of endohelminths in Cairina moschata (Linnaeus, 1758) of the Portel microregion, Marajó Island, Pará

## TL;DR

This study found various helminth parasites in muscovy ducks in northern Brazil, contributing to understanding parasitic diseases in the region.

## Contribution

The study expands knowledge of helminth fauna in muscovy ducks in the Amazon region.

## Key findings

- Five nematode species, two trematodes, and cestodes were identified in muscovy ducks.
- The overall helminth infection rate was 50% among the 12 studied birds.
- Nematodes were the most prevalent helminths, followed by trematodes and cestodes.

## Abstract

This study was conducted in northern Brazil to determine the prevalence of helminth infections in Cairina moschata (Linnaeus, 1758). Between August 2024 and July 2025, adult parasites were collected from the gastrointestinal tracts of 12 of these subsistence birds in the municipality of Portel, Marajó, Pará. The analyses revealed the presence of the nematodes Ascaridia galli, Tetrameres sp., Heterakis gallinarum, Eucoleus contortus, and Capillaria cairina; the trematodes Echinostomatidae and Strigea sp., and various cestodes. The overall infection rate was (50%; 6/12). The most common helminths were nematodes (33.33%; 4/12), trematodes (25%; 3/12), followed by cestodes (8.33%; 1/12). These findings expand the current knowledge of the helminth fauna in muscovy ducks raised on Marajó Island and contribute to an epidemiological understanding of parasitic diseases affecting species of zootechnical importance in the Amazon region.