In the study by Whitfield 1990 (1) I found the information that the parasitic wasp from family Ichneumonidae have interesting symbiotic viruses called polydnaviruses. This virus stay as provirus in the wasps genome and is transmitted vertically between subsequent generations of parasitoid. It does not harm the wasp and it is transmitted to the wasps hosts (usually caterpillar). The virus does not replicate in the caterpillar, but alter it's physiology: supress immune response and metamorphosis and increases the amount of nutrients in caterpillars hemolymph.
Still, I have not found any references about this kind of virus altering the behaviour of the caterpillar after the emergence of wasps larvae.
[1] Whitfield, J. B. (1990). Parasitoids, Polydnaviruses and Endosymbiosis. Parasitology Today, 6(12), 381-384. (free PDF)
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