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An interesting form of mutualism:

Parasitoid wasps serve as hosts for the virus, and Lepidoptera serve as hosts for these wasps. The female wasp injects one or more eggs into its host along with a quantity of virus. The virus and wasp are in a mutualistic symbiotic relationship: expression of viral genes prevents the wasp's host's immune system from killing the wasp's injected egg [...]

I'm guessing suppressing the immune system of the host is done by other parasitic species in various ways, but are there any other examples in which a virus is "used" for this purpose?

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