If a parasitic animal (such as a wasp) is adapted to kill its host, it is called a “parasitoid,” the wasp larvae grows to adulthood and survives the death of its host.
True parasites need to reproduce before the host dies to be successful.
When a parasite benefits its host (mycorrhizal fungi for example) then by definition it is not a parasite, it is a commensal or mutualistic partner.
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