Smile Infection

Intro  the year 2040. It was a normal year, till suddenly the news report strange things...people suddently begin to laugh like they are insane...and tey cant stop. A few months later, the Infection has spread world wide. Many people are infected and only a few people left who arent infected. They live in big groups, like a family, to protect each other. You are one of them. You live in a camp with a few other people. Everything goes fine until one day...a person from yalls camp begins to laugh uncontrolably. What will you do? Btw please ignore the voice