Plague is a serious infection of humans caused by bacteria called Yersinia pestis. It is usually caused by the bite of a flea that has fed on an infected wild animal, such as a rat, chipmunk or prairie dog. It usually causes large sores and abscesses in the glands of the arms and legs. Dogs and cats can also become infected and can spread the disease to their human companions. Even though, human cases are rare. Plague is treatable with antibiotics. Did you hear about anyone getting this disease in your area?