PVS 1000 Lecture Notes - Lecture 4: Haemonchus Contortus, Coccidia, Abomasum

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Each segment can turn into individual organism. Insects (directly cause disease or act as vectors of other agents) Some parasites have species-specificity and can only infect specific hosts. Direct life cycle - only one host needed for complete parasitic development from egg to adult to egg. Indirect lifecycle - more than one host is required for the parasite to develop from egg to adult to egg. Most nematode parasites affecting animals have a direct life cycle prepatent period - time from parasite ingestion until egg she in feces. Bottle jaw edema due to protein loss in blood. Definite host - host which is infected and affected by disease caused by parasite. Intermediate hosts - carrier hosts which are unaffected by the parasite forage mites. Can cause unthriftiness, diarrhea and intestinal obstruction. As aquaculture industry grows, the risk of infection from nematodes increases.

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