"C. aerophila is a lungworm that has a direct lifecycle infecting dogs and other carnivores. The eggs are produced in the lungs, coughed up, and then swallowed to be passed through the feces. Reinfection occurs when the eggs are consumed by the new host through food or water" (Merck vet manual).
Biology - Life Cycle of Capillaria hepatica. Centers for Disease Control and Prevention. http://www.cdc.gov/parasites/capillaria/biology_c_hepatica.html
Merck vet manual. http://www.merckvetmanual.com/mvm/respiratory_system/respiratory_diseases_of_small_animals/lung_nematodes_in_small_animals.html#v3294928?qt=&sc=&alt=
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