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==''Linguatula serrata''==
==''Linguatula serrata''==
*Also known as the 'tongue worm'
'''Recognition'''
*Tongue-like appearance
**Expanded anteriorly
*Adults are over 10cm in length
**Females measure betwen 30-130mm in length
**Males measure up to 20mm in length
*Transversely striated
'''Life Cycle'''
*6 month life cycle
*Adults inhabit the nasal passages of dogs and sometimes cats
*Eggs are expelled by coughing and sneezing or are passed out with the faeces
*Herbivorous intermediate hosts ingest the eggs
*Eggs hatch in the herbivore intestine
*Larvae migrate to the mesenteric lymph nodes and encyst to become infective nymphs
**Cysts measure 1mm in diameter
*When a dog eats infeced uncooked viscera the life cycle is completed
*Infective nymphs migrate from the viscera during chewing and crawl up into the nasal cavity via the soft palate
*Infective nymphs mature to adults in the nasal cavities and can survive for a year in the final host
'''Pathogenesis'''
*Causes [[Nasal Cavity Inflammatory - Pathology#Infectious causes of rhinitis|rhinitis]]
*Heavy infection leads to coughing, sneezing and nasal discharge
==Sea Lice==
==Sea Lice==
==Links==
[[Respiratory Parasitic Infections - Pathology#Linguatula serrata|Pathology of ''Linguata serrata'' in the nasal passages]]