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One of 2 things:

  1. it dies with the host
  2. it must find a new host
Some parasites actually do this deliberately, they make their host do something to get itself eaten by their next host. When the old host is eaten it dies, but the parasite is now where it needs to be to infect its next host.

One example are lancet flukes that parasitize ants, cattle, and snails. When the parasites are ready to move from the ant to cattle, every evening the parasites make the infected ant leave the anthill and climb to the top of a blade of grass; if grazing cattle in the night eat that blade of grass, the ant dies but the parasites have found their next host; if the ant has not been eaten by the morning and it remained on the blade of grass it would be baked in the sun and both the ant and the parasites would die before any cattle could eat them, so the parasites make the infected ant climb down and return to its normal life in the anthill. Once in cattle the parasites mature and lay eggs, which are excreted in manure, snails eat the manure and the eggs hatch in the snails, the newborn parasites are excreted in the snail's slime, which is eaten by ants.

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11y ago

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