The couple finally got married. No, nobody was sick. In fact everyone had gotten over their muscle parasites already. They celebrated their honeymoon by fighting off a too long-ignored bug infestation in the nearby mountain.
I learned several valuable lessons from that. First, colonists can remove their draft status whenever without warning, because apparently they do not understand the concept of a military draft. Second, it's surprisingly easy to increase the temperature of an entire mountain cave complex to "literal hell". The plan was, I'd create a kill-room with stone walls, wood floors, a stockpile of alpaca wool(I have way too much of this), and a small stack of chemfuel, along with an IED trap to start the party. Originally, I had intended to use a boomrat or boomalope as bait, but couldn't tame one quickly enough. Then I tried a useless chinchilla, but the bugs wouldn't take the bait even after I sent it deeper into the tunnel.
Then I sent Yoonie in with an incendiary launcher to draw aggro. She managed to ignite one of the megaspiders, who in turn ignited one of the hives. Then she ran. Barely got through the kill-room before the bugs got there. Took longer than I expected for the bugs to trigger the IED, but the explosion worked mostly as planned, in that it exploded and the room ignited. The bugs were scorched, and in their fiery panic they tried digging around the kill-room, even exposing an outside tunnel by a corner. It wasn't enough, and the whole cave system started glowing orange and the bugs began suffering heatstroke. Sadly, all the jelly caught fire as well. Other than Yoonie, none of the other colonists needed to fire a shot.
Next time I get an infestation, it shouldn't be hard to repeat the tactic without the swarm attacking. I think it hit over 600°C at one point(for reference, lead melts at little more than half that).