EVERYDAY SCIENCE

Detailed explanation-1: -Bubonic plague is a type of infection caused by the Yersinia pestis (Y. pestis) bacterium which is spread mostly by fleas on rodents and other animals.

Detailed explanation-2: -Flea bites. Plague bacteria are most often transmitted by the bite of an infected flea. During plague epizootics, many rodents die, causing hungry fleas to seek other sources of blood. People and animals that visit places where rodents have recently died from plague are at risk of being infected from flea bites.

Detailed explanation-3: -There are more than 2, 000 types of fleas in existence, but it is primarily the Oriental Rat Flea that is attributed to the plague bacteria. As its name suggests, this flea mostly feeds on rodents, but can also bite humans and household pets.