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In page Mammomonogamus:

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While the complete life cycle is still not fully known, transmission is thought to be oral-fecal, where infection comes from ingesting contaminated food or water containing embryonated eggs, hatched larvae, or intermediate hosts. Possible intermediate host candidates include earthworms, snails, and arthropods.[14] Eggs are expelled in sputum or feces. Most often, travelers to tropical climate places become exposed to contaminated sources and are diagnosed upon return to their country. The best preventative measure is to ensure proper food preparation and water sanitation.