Mecistocirrus digitatus is a hematophagous abomasal nematode which causes significant blood and production losses in cattle. The objectives of the present study were to: (1) report the reappearance of M. digitatus in cattle from the Mexican tropics using microscopy, scanning electron microscopy (SEM), and molecular identification, and (2) determine the prevalence of M. digitatus in slaughtered adult cattle from the Mexican tropics. Gastroinestinal nematodes (GIN) were recovered from the abomasum of an 8-yr-old cow (Holstein × Zebu) previously diagnosed with Johne's disease. Of 1,254 GIN, 98.8% were identified as M. digitatus and 1.2% as Haemonchus sp. SEM was used to identify ultrastructure features of M. digitatus (oral cavity, cervical papillae, bursa, bursa lobes papillae, male spicules, anus, and female vulva). A conventional PCR method was used to corroborate the morphological findings. The prevalence of adult cattle infected with M. digitatus and Haemonchus sp., determined from 68 adult cattle from different grazing tropical herds, was 38.2% and 8.8%, respectively. Ninety-eight percent of animals infected with M. digitatus presented lesions in their abomasum such as mucosal inflammation, hemorrhage, and ulcers; some of them had necrosis. The current reappearance of M. digitatus in a Mexican herd suggests the possibility of an underestimated prevalence of this nematode amongst grazing cattle.
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1 June 2014
Reappearance of Mecistocirrus digitatus in Cattle from the Mexican Tropics: Prevalence, Molecular, and Scanning Electron Microscopy Identification
Elke von Son-de Fernex,
Miguel Ángel Alonso-Díaz,
Pedro Mendoza-de-Gives,
Braulio Valles-de la Mora,
Enrique Liébano-Hernández,
María Eugenia López-Arellano,
Liliana Aguilar-Marcelino
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Journal of Parasitology
Vol. 100 • No. 3
June 2014
Vol. 100 • No. 3
June 2014