There's no diseases on Minecraft. You killed Pillager patrol, and got Bad Omen effect. Don't go to any Villages, if you don't want to get the villagers mauled to death. You can get rid of the effect by drinking bucket of milk.
If you do enter a village, pillagers (like the ones you killed) and witches will spawn and start attacking all the villagers. If you can fend them off, villagers will give you a discount and free loot.
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Watch out for the crabocalypse. Some say the day will never come. But it will.
Feel free to drop by for a chat whenever.
If you'd like to talk with me about other games, here are a few I play.
Team Fortress 2
Borderlands series (Borderlands 2 is my favorite game, ever. TPS combat is a lot of fun and makes up for the lower-quality story, in my opinion)
Elder Scrolls series
Warframe (IGN is something like That_One_Flesh_Atronach)
Pokémon series (HGSS forever)
Left 4 Dead 2 (Boomer files always corrupt though)
SUPERHOT (SUPERHOT is the most innovative shooter I've played in years!)
Dead Rising series (Dead Rising 2 is one of my favorite games, and the 3rd was a lot of fun. 1st has poor survivor AI and the 4th is bad)
7 Days to Die
Just Cause series
Come to think of it, I mainly play fighting-based games.