Parasites and pathology of the respiratory tracts of native and feral mammals in Australia - a review.

Abstract

This paper summarizes knowledge of the biodiversity and pathology associated with parasites of the respiratory tract of wild mammals, including feral species, in Australia. Representatives of 21 genera of nematodes distributed in the superfamilies Trichostrongyloidea, Metastrongyloidea, Thelazioidea, Filarioidea, Trichinelloidea and Muspiceoidea are included. Larval stages of the cestode, Echinococcus granulosus, occur in the lungs of macropodids and feral pigs (Sus scrofa). Trematodes occur in the lungs of dugongs (Dugong dugon) and in the cranial sinuses and blowholes of dolphins. Pentastomes occur in the lungs of the sugar glider (Petaurus breviceps) and in the frontal sinuses of dingoes (Canis lupus dingo) and foxes (Vulpes vulpes). Nymphal stages of the latter have been found in the lungs of rabbits (Oryctolagus cuniculus) and nymphs of a pentastome of tree pythons occur in the lungs of the northern brown bandicoot (Isoodon macrourus). Pneumonyssid mites occur in the lungs of the northern brushtail possum (Trichosurus vulpecula arnhemensis) and an undescribed speleognathine mite has been found in the lungs of P. breviceps. Trombiculid, tydeoid, dermanyssid and halarachnid mites are endoparasitic in the nasal sinuses of rodents, antechinuses, possums, gliders, elephant seals and fur seals. Larvae of oestrid bot-flies occur in the trachea of macropodids and in the nasal sinuses of camels (Camelus dromedarius). Host specificity in these parasites represents the full spectrum from species specific to class catholic with the intranasal chigger, Ascoschoengastia rattus, occuring in metatherian and eutherian mammals as well as varanid lizards. Similarly, pathological changes associated with these parasites range from inapparent to verminous bronchitis and bronchiolitis resulting in mortalities or severely impaired respiratory reserve or hypoxia precipitating death.