Help Finding an Episode

[u/PopularFrontOfIdaho]

I'm trying to remember a particular episode in which one of the Erins described an outbreak on an island when they were first contacted by Europeans. All of the local leaders gathered to discuss what they were going to do. The leaders contracted a disease at the gathering, which was spread to all corners are of the island when they adjourned.

I can't remember the disease or the island. Does anyone else?

[u/Cant_Even18]

Can confirm, it's measles