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Salmonella (cont.)

What Is the Prognosis for Patients Infected With Salmonella?

The prognosis for salmonellosis is very good since it is a self-limiting disease in most patients. Even immunosuppressed patients can do well if the disease is diagnosed and treated promptly. Complications occur if patients become dehydrated or if the disease is caused by aggressive or drug-resistant serovars.

Patients diagnosed with paratyphoid fever usually do well and develop fewer complications than patients with typhoid fever. If patients with paratyphoid or typhoid fever are diagnosed early and appropriate antibiotics are given, few or no complications develop and the patients recover. Untreated cases of typhoid result in some patients developing complications that can be severe and result in permanent disability or death. Patients infected with S. typhi serovars that are resistant to multiple drugs have a worse prognosis and can develop more complications.

Prevention of Salmonella Infections

For all Salmonella diseases, the key to prevention is proper hygiene and enforcement of public health rules and regulations. Proper hygiene starts with hand washing with soap and water before eating and especially after handling any raw foods such as eggs, meat, or produce. Avoiding direct contact with carriers of Salmonella (for example, turtles, snakes, chickens, pigs, and typhoid patients) reduces the chance of infection. Public-health practices such as chlorination of drinking water, enforcing restaurant cleanliness and employee hand washing, and not allowing human carriers of Salmonella to work in the food-handling industry further reduce the chance of Salmonella exposure. Perhaps the most famous failure of public health measures was in 1907 when a cook named Mary Mallon (Typhoid Mary) was suspected of infecting hundreds of individuals with a S. typhi serovar.

The CDC issues recalls of items, usually processed foods or vegetables, found to be contaminated with S. spp or other infectious or poisonous agents. People that take heed of these warnings and the accompanying advice reduce their chance of infection. In the past several years, recalls and reports of S. spp contamination of ground turkey (reportedly a drug-resistant strain in 2011), eggs, parsley, dog food, and other items have been publically announced. Most recently, mangoes, cantaloupes, and Wawa Fruit Cups have been cited or recalled because of S. spp contamination. The source of cantaloupe contamination has been traced in August 2012, to Chamberlain Farms Produce; the company has suspended all melon shipments.

Currently, there is no vaccine available to prevent salmonellosis, and the CDC does not recommend the general population be vaccinated against S. typhi serovars. However, the CDC does recommend that individuals going to developing countries where typhoid fever is endemic (some regions in Africa, Asia, and Latin America) be vaccinated with a typhoid vaccine. There are two types of vaccines currently available to individuals. Ty21a is an oral vaccine that requires four doses administered two weeks before travel, while ViCPS vaccine is injected once and requires only one dose administered one week before travel. The Ty21a immunization requires a booster every five years with the minimum vaccination age of 6 years, while ViCPS requires a booster every two years with a minimum vaccination age of 2 years. Work is in progress to develop additional vaccines for all Salmonella infections.

Medically reviewed by Robert Cox, MD; American Board of Internal Medicine with subspecialty in Infectious Disease


Owens, Michael D. "Salmonella Infection in Emergency Medicine." Apr. 23, 2012. <>.

United States. Centers for Disease Control and Prevention. "Multistate Outbreak of Salmonella Typhimurium and Salmonella Newport Infections Linked to Cantaloupe." Sept. 13, 2012. <>.

United States. Centers for Disease Control and Prevention. "Salmonella." Sept. 27, 2012. <>.

Medically Reviewed by a Doctor on 5/25/2016

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