Smile tapes

People got crazy killing people for fun and they can’t control it. They laugh extremely much and their smile is unnaturally big. There a stages of the infection stage 1 week 1-2 the infected are still in control of they’re mind but they are developing a smile. Stage 2 week 2-3 they have lost control of they’re mind and start attacking people with laughter and a unatural big smile. Stage 3 week 3-4 they start calming down but there face looks like a burned face they still have a little smile and still try to attack people but aren’t as dangerous. Stage 4 week 4-5 many don’t live up to this stage and die before it they aren’t dangerous anymore and have Alzheimer they don’t remember anything and eventually die