According to the Baidu question bank, the topic "The second plague epidemic has an impact on human civilization" is (). A. accelerate the decline of the eastern Roman empire. B. the beginning of public health. C. the beginning of scientific prevention and control measures for infectious diseases. The answer is B, so it is the beginning of public health.

Plague is a natural focus disease caused by Yersinia pestis. Plague is caused by rat fleas introduced into human skin, and pneumonic plague is caused by respiratory tract. The clinical manifestations are fever, lymphadenopathy, pneumonia and bleeding tendency. It can develop into septicemia, which is a highly contagious disease with high mortality. It is one of the most serious infectious diseases that harm human beings.