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What is the life cycle of parasitic worms?

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Life-cycles Helminths form three main life-cycle stages: eggs, larvae and adults. Adult worms infect definitive hosts (those in which sexual development occurs) whereas larval stages may be free-living or parasitize invertebrate vectors, intermediate or paratenic hosts.


How long is the life cycle of parasites?

It takes about 100 days to break the parasite life cycle, which is the key to reducing the parasite burden on the pasture. This can be done by timing multiple applications throughout the season or using a product with longer persistency.

How long does it take for parasitic worms to grow?

If the eggs hatch around the anus, the newborn worms can re-enter the bowel. Eggs that have been swallowed will hatch inside the intestine. After 2 weeks, the worms reach adult size and begin to reproduce, starting the cycle again.

How long do parasitic worms live outside the body?

Tapeworms can live outside for months, waiting for a host to come along. You're most at risk if you work around livestock or travel to a country where hygiene is poor. You can also be infected if you eat or drink something that contains tapeworm eggs or larvae, like raw or undercooked beef or pork.

Why parasitic worms have such complex life cycles?

Since fewer parasite stages are lost to mortality and more make it to the definitive host via trophic transmission, overall transmission rates increase. Both downward incorporation and upward incorporation are thought to have led to the evolution of complex life cycles for some parasite species.

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