Rat lungworm has a ground zero, Puna.

[eigoya]

Just another twist as I've taken to swimming in the Hot Ponds after a nearly two year hiatus: if we can get RLW from a slug (2?5? 15?) in catchment water, how many semi-slugs in the hot ponds would be a critical mass to lead to infection? Admittedly, it is super large, there is constant flow of salt water (most days), but there are probably hundreds or far more semi slugs in and around the pond.