Paratyphoid fever, also known simply as paratyphoid, is a bacterial infection caused by one of the three types of Salmonella enterica. Symptoms usually begin six to thirty days after exposure and are the same as those of typhoid fever. Often there is a gradual onset of a high fever over several days. Weakness, loss of appetite, and headaches also commonly occur. Some people develop a skin rash with rose colored spots. Without treatment symptoms may last weeks or months.