Jerry Jerm wants to be friends with all the school kids. But the kids tell Jerry that he is not cool enough.

Jerry becomes angry with the kids and decides that he is going to infect them with the flu.

Jerry does not wash his hands properly or cover his mouth when he coughs and gets Gary sick on purpose.

So, Gary goes to school sick, but doesn't wash his hands or cover his mouth when he coughs and infects all of the other school kids.

Because everyone at school is sick, the school has to shut down and everyone has to go home because of Jerry.