<P> The three types of plague are the result of the route of infection : bubonic plague , septicemic plague , and pneumonic plague . Bubonic plague is mainly spread by infected fleas from small animals . It may also result from exposure to the body fluids from a dead plague - infected animal . In the bubonic form of plague , the bacteria enter through the skin through a flea bite and travel via the lymphatic vessels to a lymph node , causing it to swell . Diagnosis is made by finding the bacteria in the blood , sputum , or fluid from lymph nodes . </P>
<P> The three types of plague are the result of the route of infection : bubonic plague , septicemic plague , and pneumonic plague . Bubonic plague is mainly spread by infected fleas from small animals . It may also result from exposure to the body fluids from a dead plague - infected animal . In the bubonic form of plague , the bacteria enter through the skin through a flea bite and travel via the lymphatic vessels to a lymph node , causing it to swell . Diagnosis is made by finding the bacteria in the blood , sputum , or fluid from lymph nodes . </P>
where does the germ that causes bubonic plague normally live in nature
where does the germ that causes bubonic plague normally live in nature
fleas from small animals
fleas from small animals