I ended up keeping Mikayla home. It's only first grade - I don't think she feel like she'll "never catch up" if I keep her home another day - better safe than sorry.
While I was typing the last post, Michele emailed to say that both Ellie and Traig had thrown up already this morning... Woah! This is one potent little stomach bug - we were very careful to not have them share food, etc. And, fast... I'm very glad we didn't interact with any of Mikayla or Brayden's other friends over this four day weekend, and if this thing is spreading this much, I guess I'm glad my kids have already had it. (Clearly, Brayden had to pick it up from someone, so I wonder what the absentee rate on his class has been...). The verdict is still out on Nati, she was still asleep when Michele emailed - she's keeping her home as well for good measure.
So, my wisdom for the day - if you know that someone has had this kind of bug - STAY CLEAR!