In this video, Xenos moutoni are carefully extracted from hornets. Xenos parasites, in the order Strepsipsera, live their entire lives in the abdomens of wasps and similar insects, altering the host's behavior. Here's a story about Xenos vesparum, which parasitizes paper wasps. And here's a scientific paper about Xenos myrapetrus, which lives within swarm-founding wasps.
The infected wasp begins to suffer nutritionally, then flies to meet with other infected wasps. The male parasite exits the wasp's abdomen and mates with the female parasites which stay inside their host. Wasps infected with the male parasite die. Wasps infected with the female parasite then fatten themselves up much like queen wasps do. They then fly to meet with other uninfected queen wasps. Then when the parasite is mature, the infected wasp flies to mingle with other uninfected wasps, thereby spreading brood and larvae into new environments.
Tiny tweezers and a steady hand.