Nothing like a big game you waited all year for and having your best 4-5 players out. Vaccinate your kids!
Good coaches don't wait all year for a big game. Coaching hockey is a development journey, not a sprint for 1 game. What if the bottom 4-5 get the flu? Would likely help my team!
I sincerely doubt what you're talking about is the flu that flu shots help prevent (influenza). Most likely a cold that has flu-like symptoms. Flu shots won't prevent that.