Typhoid fever in human beings is caused byAPlasmodium vivaxBTrichophytonCSalmonella typhiDRhinoviruses.Answer: C. Salmonella typhi Read Explanation: Typhoid fever is a life-threatening infection caused by the bacterium Salmonella Typhi. It is usually spread through contaminated food or water. Once Salmonella Typhi bacteria are ingested, they multiply and spread into the bloodstream. Read more in App