eMedicine Specialties > Pediatrics: General Medicine > Infectious Disease

Salmonella Infection: Differential Diagnoses & Workup

Author: Archana Chatterjee, MD, PhD, Professor of Pediatrics, Medical Microbiology and Immunology, and Pharmacy, Division of Pediatric Infectious Diseases, Chief of Division of Pediatric Infectious Diseases, Creighton University School of Medicine; Hospital Epidemiologist and Medical Director of Infection Control, Children's Hospital
Coauthor(s): Catherine O'Keefe, DNP, APRN, Assistant Professor of Nursing, Pediatric Nurse Practitioner, Pediatric Infectious Diseases, Creighton University School of Nursing; Meera Varman, MD, Assistant Professor, Department of Pediatrics, Section of Pediatric Infectious Diseases, Creighton University School of Medicine
Contributor Information and Disclosures

Updated: Jan 9, 2009

Differential Diagnoses

Colitis
Food Poisoning
Gastroenteritis
Shigella Infection

Other Problems to Be Considered

Viral enteritis
Toxic ingestions
Bacterial gastroenteritis
Parasitic infections

Workup

Laboratory Studies

The following tests are indicated in Salmonella infection:

  • CBC count with differential
    • CBC count is often 10,000-15,000/μ L in simple gastroenteritis.
    • Patients with enteric fever commonly have anemia, thrombocytopenia, or neutropenia, although a shift to more immature forms can be seen on the differential count.
  • Cultures
    • Isolation of Salmonella from cultures of stool, blood, urine, or bone marrow is diagnostic.
    • Cultures of rose spots and/or bone marrow aspirate may be positive in enteric fever even when stool culture findings are negative for Salmonella.
  • Stool examination: Stool may be hemoccult positive and may have positive findings for fecal polymorphonuclear cells.
  • Chemistry
    • Electrolyte tests may reveal metabolic acidosis or other abnormalities consistent with dehydration.
    • Patients with enteric fever may have mild hepatitis.
  • Serologic tests: Tests for Salmonella agglutinins (febrile agglutinins, Widal test) may suggest infection with S typhi; however, they are not recommended because of the number of false-positive and false-negative results.

Imaging Studies

  • Imaging studies are not necessary for most patients with simple gastroenteritis and enteric fever without any severe complications.
  • Consider chest radiography if pneumonia is suggested as the result of bacteremia.
  • Perform abdominal radiography if the patient presents with peritoneal signs on physical examination. Consider intestinal perforation as a complication of enteric fever.
  • Perform a bone scan if osteomyelitis is considered as a complication of bacteremia. MRI, which is more sensitive, can be done to evaluate osteomyelitis.

More on Salmonella Infection

Overview: Salmonella Infection
Differential Diagnoses & Workup: Salmonella Infection
Treatment & Medication: Salmonella Infection
Follow-up: Salmonella Infection
References
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References

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Further Reading

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Keywords

Salmonella infection, bacterial gastroenteritis, infectious colitis, Salmonella typhi, S typhi, enteric fever, typhoid fever, Salmonella enteritidis, S enteritidis, nontyphoidal Salmonella, NTS, bacteremia, meningitis, food-borne gastroenteritis, osteomyelitis, cell disease, AIDS, neoplasms, appendicitis, hepatosplenomegaly, bradycardia

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Contributor Information and Disclosures

Author

Archana Chatterjee, MD, PhD, Professor of Pediatrics, Medical Microbiology and Immunology, and Pharmacy, Division of Pediatric Infectious Diseases, Chief of Division of Pediatric Infectious Diseases, Creighton University School of Medicine; Hospital Epidemiologist and Medical Director of Infection Control, Children's Hospital
Archana Chatterjee, MD, PhD is a member of the following medical societies: American Academy of Pediatrics, American Society for Microbiology, International Society for Infectious Diseases, Pediatric Infectious Diseases Society, and Society for Pediatric Research
Disclosure: GlaxosmithKline Honoraria Speaking and teaching; MedImmune Honoraria Speaking and teaching; Merck Honoraria Speaking and teaching; Sanofi-Pasteur Honoraria Speaking and teaching; Wyeth Honoraria Speaking and teaching; GlaxoSmithKline Grant/research funds Other; MedImmune  Other; Merck Grant/research funds Other; Novartis Grant/research funds Other; Sanofi-Pasteur Grant/research funds Other

Coauthor(s)

Catherine O'Keefe, DNP, APRN, Assistant Professor of Nursing, Pediatric Nurse Practitioner, Pediatric Infectious Diseases, Creighton University School of Nursing
Catherine O'Keefe, DNP, APRN is a member of the following medical societies: American Academy of Nurse Practitioners, National Association of Pediatric Nurse Practitioners, and Nebraska Nurse Practitioners
Disclosure: Nothing to disclose.

Meera Varman, MD, Assistant Professor, Department of Pediatrics, Section of Pediatric Infectious Diseases, Creighton University School of Medicine
Meera Varman, MD is a member of the following medical societies: American Academy of Pediatrics, Infectious Diseases Society of America, and Pediatric Infectious Diseases Society
Disclosure: phamaceutical companies Honoraria Speaking and teaching; phamaceutical companies Grant/research funds clinical trials

Medical Editor

José Rafael Romero, MD, Director of Pediatric Infectious Diseases Fellowship Program, Associate Professor, Department of Pediatrics, Combined Division of Pediatric Infectious Diseases, Creighton University/University of Nebraska Medical Center
José Rafael Romero, MD is a member of the following medical societies: American Academy of Pediatrics, American Society for Microbiology, Infectious Diseases Society of America, New York Academy of Sciences, and Pediatric Infectious Diseases Society
Disclosure: Nothing to disclose.

Pharmacy Editor

Mary L Windle, PharmD, Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy, Pharmacy Editor, eMedicine
Disclosure: Pfizer Inc Stock Investment from financial planner; Avanir Pharma Stock Investment from financial planner ; WebMD Salary and stock Employment and investment from financial planner

Managing Editor

Larry I Lutwick, MD, Professor of Medicine, State University of New York, Downstate Medical School; Director, Infectious Diseases, Veterans Affairs New York Harbor Health Care System, Brooklyn Campus
Larry I Lutwick, MD is a member of the following medical societies: American College of Physicians and Infectious Diseases Society of America
Disclosure: Nothing to disclose.

CME Editor

Robert W Tolan Jr, MD, Chief, Division of Allergy, Immunology and Infectious Diseases, The Children's Hospital at Saint Peter's University Hospital; Clinical Associate Professor of Pediatrics, Drexel University College of Medicine
Robert W Tolan Jr, MD is a member of the following medical societies: American Academy of Pediatrics, American Medical Association, American Society for Microbiology, American Society of Tropical Medicine and Hygiene, Infectious Diseases Society of America, Pediatric Infectious Diseases Society, Phi Beta Kappa, and Physicians for Social Responsibility
Disclosure: GlaxoSmithKline Honoraria Speaking and teaching; MedImmune Honoraria Consulting; MedImmune Honoraria Speaking and teaching; Merck Honoraria Speaking and teaching; Novartis Honoraria Speaking and teaching; sanofi pasteur Grant/research funds Unrestricted research grant; sanofi pasteur  Consulting; sanofi pasteur Honoraria Speaking and teaching; Tap Honoraria Speaking and teaching; Baxter Healthcare Honoraria Speaking and teaching

Chief Editor

Russell W Steele, MD, Head, Division of Pediatric Infectious Diseases, Ochsner Children's Health Center; Clinical Professor, Department of Pediatrics, Tulane University School of Medicine
Russell W Steele, MD is a member of the following medical societies: American Academy of Pediatrics, American Association of Immunologists, American Pediatric Society, American Society for Microbiology, Infectious Diseases Society of America, Louisiana State Medical Society, Pediatric Infectious Diseases Society, Society for Pediatric Research, and Southern Medical Association
Disclosure: None None None

 
 
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