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Parasitic Gastroenteritis (view source)
Revision as of 18:02, 26 December 2008
, 18:02, 26 December 2008→Host Immunity
a) ''Reduction in establishment of larvae'':
a) ''Reduction in establishment of larvae'':
e.g. fewer L3 establish in an immune adult cow than a parasite naive calf.
e.g. fewer L3 establish in an immune adult cow than a parasite naive calf.
b) ''Expulsion of an existing worm burden ("self cure")'':
Due to immediate-type hypersensitivity reaction to antigen from incoming L3? Non-specific factor in grass?
c) ''Arrested development'':
Minor role only; arrested development mainly caused by climatic changes, e.g. temperature changes (''Ostertagia''), drought (''Haemonchus'').
d) ''Stunting worm growth'':
e.g. worm length.
e) ''Reduction in biotic potential'':
Host immunity often reduces egg production by female worms. This results in a stereotyped pattern of worm egg output, regardless of the level of infection.