I work in this field (Infection Prevention and Control) and we get a few necrotizing fasciitis cases each year (I work at a large, tertiary hospital). Very rar

I work in this field (Infection Prevention and Control) and we get a few necrotizing fasciitis cases each year (I work at a large, tertiary hospital). Very rarely are cases related to each other, and therefore have some common source of infection. More often than not, the cases are completely random and the patients could have done nothing to prevent it. Some may find that worrisome, for example, patients that get infections from such minor injuries such as a cut from gardening or falling on pavement. But other than keeping wounds clean, there isn't much you can do, so it shouldn't be something people should worry about.