DD aged 9, her friend was dropped off at ours on Sunday for a night as his parents had something come up.
Child arrives and has an obvious case of conjunctivitis. 
They knew this but left him anyway...but that's another story.
I'm in Oz so it's Tuesday morning here. Last night, Monday evening...DD's eye was all pink in the corner. It was itchy. I bathed it in a bit of salt water.
This morning it's calmer but still a little bit pink...a very little bit.
Does she need to stay off school?