"Gene-mutation" centre shift

It was just a regular morning shift at the Desborough Vaccination Center, but then a rogue walk-in from the exit told me I was participating in a "gene-mutation therapy" activity. For a moment I nearly fell off the edge of his flat Earth but managed to stay steady and calm, and encouraged him to take his shiny personality to somewhere else. Anyway, after that it was simply the regular helping us all move forward towards a Covid-free world. What a way to keep it interesting!