I love that I live in a world where this is a thing. That I could own a cuddly toy of the Black Death or leprosy.
Such things appeal to my dark sense of humor. When I first discovered them (introduced by a gleeful Biologist friend), I couldn't stop laughing. I kept the tab open all night, and had to keep peeking back through the rest of the range, tittering anew with each fresh flick through the range.
But there's a more serious side to this too. Giant Microbes present a cute, cuddly face for your children; a tangible form to clasp, as they come to terms with what's gone wrong with their health. Good for adults in the same situation too!