Head Lice !!

So I have been watching a 1 year old boy for 3 going on 4 weeks. Today I was informed he has head lice, and is trying to say he got it from my house who never has kids and is very clean. I'm so pissed right now. Not only do I have a 2 month old. The nursrey teacher at church said he's had it for 2 weeks and she just told me!!! Gosh I'm furious what would yall do ???