Leftie Loosey decides to get vaccinated, and it's the worst mistake of her life.

Not a direct sequel to Pinkie Pie Tries Mareijuana, but a story in the same vein. This is inspired by the very reliable and studious moms who educate themselves with Facebook memes and anti-science echo chambers to warn us all of the dangers of vaccines. Also heavily inspired by the bible tracts of Jack Chick, because why not.