How Sick Is Too Sick To Go To School?

I was never really allowed to stay home sick when I was a kid. I mean unless I was bleeding my parents made me go to school. So this is pretty funny to read. According to the Huffington Post there is SICK and TOO SICK. I still say a fever is a clear deal breaker. If your kids has a fever KEEP THEM HOME! So what do you think? Is there a line when it comes to being sick? Would you still send your kid to school?