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Because it would deprive itself of its food-source. Parasites thrive by feeding off a 'host' - rather than catching their own food. If they kill off the host - they either have to find another host - or die !

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Rubye Mante

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2y ago
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13y ago

A parasite doesn't kill it's host because if it's host dies, the parasite then also dies because now, the parasite has no where to live and nothing to feed off of!!!

Actually, many parasites do kill their host. The key is that parasites do not want to kill their host until after they have found a new host. After a parasite finds a new host, it no longer "cares" if the old host dies or lives. Diseases (parasites) that are transmitted to a new host very easily often kill their hosts. Diseases that are NOT transmitted easily to a new host often will make you sick, but will not kill you; these diseases want you up, walking around, and interacting with as many people as possible so that they can be picked up by a new host.

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10y ago

One species of parasite that completely deliberately kills one of its 3 hosts is Dicrocoelium dendriticum, a lancet fluke. Its hosts are:

  1. Cattle, adult flukes lay eggs which the cattle excrete in their manure
  2. Snails, eat the manure and the eggs hatch and the flukes drill out from the snail's gut to its digestive gland, to protect itself the snail secretes slime encasing the flukes then spits out the slime
  3. Ants, eat the slime and some of the flukes attach to its nervous system and take control; in the day the infected ant behaves normally as any other ant does, but at night the flukes make it leave the safe nest and climb to the top of a tall blade of grass and clamp onto it with its mandibles, if nothing happens at night the flukes have the ant release itself from the blade of grass climb down and return to the nest, eventually though some night grazing cattle come by and one of them eats that blade of grass instantly killing the ant host, but completing the lifecycle of the parasite
Many other examples of this exist in other species of parasite, but not all such host killing parasites are so "proactive" in their methods.
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8y ago

Because at that point it can no longer exploit the host's resources. It will have to leave the host (or become dormant inside, and wait for it to decompose) or die with it. It also hinders the spreading of the parasite species.

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13y ago

Because they reproduce so quickly! One parasite make 1,000 it is very hard! Just got to try HARD, and possibly continuously

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12y ago

Because killing it's host will inadvertently kill itself when it runs out if resources.

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Q: Why is it so hard to kill most parasites?
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