Trichostrongylus spp

In practical terms this means that piperazine does not add to the anthelmintic effect of pyrantel on Ascaris as might be expected, but opposes it. For this reason it is usually recommended that concurrent use should be avoided, but direct clinical evidence confirming that combined use is ineffective seems to be lacking. It seems reasonable to extrapolate the results of these studies on Ascaris lumbricoides (roundworm) to the other gastrointestinal parasites for which pyrantel is used, i.e. Enterobius ver-micularis (threadworm or pinworm), Ancylostoma duodenale, Necator americanus (hookworm) and Trichostrongylus spp. However, no one seems to have studied this. 

Abbreviations used H.c. Haemonchus contortus O.c., Ostertagia circumcincta T.a., Trichostrongylus axei T.C., Trichostrongylus colubriformis C. spp., Cooperia spp. O.C., Oesophagustomum columbianum. 

The infestations by intestinal roundworms in fowls is responsible for a number of gastrointestinal problems. The common nematodes of the digestic tract of poultry are Heterakis gallinarum, H. indicn, Ascaridia galli, Capillaria spp., Strongyloides avium and Trichostrongylus tenuis. 

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