Dentro de los parasitos pulmonares del ganado vacuno se encuentran Dictyocaulus viviparus, Dictyocaulus filaria, Muellerius
capillaris y Protostrongylus rufescens, los cuales pertenece a la subfamilia de los Trichoestrongilos (Panuska 2006), los cuales tienen distribucion mundial
In goats Muellerius
capillaris is the most common lung worm.
Also there are other reports of contamination to Protostrongylus rufescent, cystocaulus ocreatus and Muellerius capillaries .
of 400 total lungs, 63 cases (15.6%) were suffered from Protostrongylus rufescent and finally, of 400 total lungs, 25 cases (6.2%) were infected by Muellerius capillaries (table 1).
 on ewe revealed that prostrongyloides family monopolized highest contamination and among this family cystocaulus with 24.6% had maximum prevalence, after it, Protostrongylus, Muellerius capillaries and Neostrongylus with 12.8, 9 and 8.8% occupied in next classes, respectively.
Shave, "Muellerius capillaris (Mueller, 1889) (Nematoda: Protostrongylidae): an unusual finding in Rocky Mountain bighorn sheep (Ovis canadensis canadensis Shaw) in South Dakota," Journal of Wildlife Diseases, vol.
Davies, "An epizootic of pneumonia in captive bighorn sheep infected with Muellerius spl," Journal of Wildlife Diseases, vol.