An infection that makes people's feet slowly grow in size, becoming fat and sweaty. The later stages of the infection start absorbing your body into your feet, until you're nothing left but a pair of massive feet on the streets.
*you look outside of your house and see the infected, people getting dumber as their feet grow. And even some people completely turned into pairs of feet, crawling around with their toes. Getting trapped between their sweaty toes would infect you.*