<Tr> <Th> Deaths </Th> <Td> 10% mortality with treatment </Td> </Tr> <Tr> <Td_colspan="2"> (edit on Wikidata) </Td> </Tr> <P> Bubonic plague is one of three types of bacterial infection caused by Yersinia pestis . One to seven days after exposure to the bacteria, flu like symptoms develop . These include fever, headaches, and vomiting . Swollen and painful lymph nodes occur in the area closest to where the bacteria entered the skin . Occasionally the swollen lymph nodes may break open . </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>

What kind of virus was the bubonic plague