ENT392 Lecture Notes - Lecture 6: Myxoma Virus, Myxomatosis, Arthropod
29 Dec 2018
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Document Summary
An organism that does not cause disease itself but which spreads infection by conveying pathogens from one host to another. Spreads the parasite by contact with successive hosts without any obligatory development of the parasite in the vector. i. ) on the surface contaminated mouthparts. 1 ii) regurgitation - some insects regurgitate onto food prior to feeding - contaminate food. iii) ingestion and defaecation (contaminated feces). ingestion of pathogens that pass through digestive tract (sufficient survival to leave viable pathogens). Time note: in these cases there is no reproduction or development of the pathogen. Most vectors - essential stage in lifecycle of pathogen/parasite. Undergoes multiplication and/or development in the vector before reaching an infective stage capable of invading new host. Dco is transmitted following ingestion by host and development in the gut. e. g. dog tapeworm (diplydium caninum) - gravid proglottids are released by tapeworm adults in the host (e. g. dog) gut. Eggs are released in the dog faeces.
