It is not possible to generalize which is more serious, bacterial or viral infections, it can depend on the specific pathogenic infection. If it is Yersinia pestis or Vibrio cholerae infection, which is more serious, not timely treatment is likely to be life-threatening, this is a bacterial infection; bacterial infection there are also relatively light, such as common bacteria caused by the urethritis, no obvious systemic symptoms, nor back pain, after timely treatment, generally can be cured; viral infection there are also light, such as rhinovirus, adenovirus caused by the common cold Most of them are self-limiting; Ebola virus infection is very heavy and the chances of survival are very low. For the specific same disease, the severity may also vary, some pathogens can be infected only as an insidious infection, but some people are infected, the systemic inflammatory response is very obvious, and even life-threatening.