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My question is can domestic animals like barnyard fowl harbor the parasites?...can you examine the feces for the lungworm"
It seems unlikely domestic animals like barnyard fowl harbor the actively reproducing adult form of the parasites, but pet rats certainly could -and perhaps other rodents like pet mice, hamsters, and gerbils, too, if they are closely related enough to the evolutionarily compatible
A. cantonensis rat host.
In rats the adult nematodes live in the cardioplumonary system and so could be detected either by dissection of the rat or by testing its feces for the presence of rat lungworm eggs.
Eyeballing the feces of a rat or any other potential carrier would not do it- these eggs are microscopic and first need to be separated from the feces and concentrated so that one can use a microscope to spot them. The process involves mashing a specific quantity of feces together with a chemical, filtering it through a certain size grid, centrifuging the resulting slurry, micropippetting up a set volume of the concentrated helminth eggs, and then examining that droplet on a microscope slide. This allows an approximate quantitative estimate to be generated of the total worm burden in the infected host. A person also needs some training to be able to figure out what s/he is looking at in the microscope: there are hundreds of different types of common parasitic worm eggs but many of them are from harmless helminths or even from worms that are just root-parasites of plants that were eaten (a normal part of our food, in other words). [I used to routinely do exactly this laboratory procedure, in Indonesia and elsewhere, as part of my research --and sometimes helping out the local clinics-- is how I happen to know.] So, yes, if using the correct procedure, then the feces of any animal can be examined for rat lungworm eggs -but they are unlikely to be detected in the feces of any critter except rats (and perhaps in closely related rodents as well).
According to experts with long experience and the scientific/medical literature, rat lungworm larvae (L3) die in any mammalian host other than rats (and possibly other rodents) before reaching adulthood but they cause a lot of trauma, allergic/inflammation response, and sepsis as they burrow around and eventually die (thus the problem).
It is less clear what is going on inside birds which eat L3; in some birds, the worms clearly do injure and kill the bird ...but in other species it may be the L3 die without doing much or any harm. Personally, I cannot see how Puna's mynah birds, ducks, chickens, Guineafowl, and peafowl manage to survive unless they have some protective factor vis a vis rat lungworm larvae, since they are certainly eating loads of them inside slugs. This is a masters thesis project or a doctoral dissertation project waiting to happen if any profs at UH have grad students ready to take such on.
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A pleasant slideshow:
http://www.thejoymovie.com
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