Treatment of Salmonella Infections

Primary Treatment Recommendation

The American College of Physicians recommends ciprofloxacin 500 mg twice daily as the first-line treatment for Salmonella infections in immunocompetent adults, though treatment is NOT routinely recommended for uncomplicated gastroenteritis in healthy individuals 1, 2

Infants <3 months of age should be treated due to high risk for bacteremia and extraintestinal spread, as recommended by the Centers for Disease Control and Prevention 3
All immunocompromised patients, including those with HIV, transplant recipients, and chronic immunosuppression, should be treated due to high bacteremia risk, as recommended by the Infectious Diseases Society of America 1, 2, 3
Patients with bacteremia/septicemia should be treated due to documented bloodstream infection, as recommended by the American College of Physicians 1, 4
Patients with severe or invasive disease requiring hospitalization should be treated, as recommended by the Society for Healthcare Epidemiology of America 1
Pregnant women should be treated due to risk of placental/amniotic fluid infection and pregnancy loss, as recommended by the American College of Obstetricians and Gynecologists 3

The Infectious Diseases Society of America recommends ciprofloxacin 500 mg PO twice daily for immunocompetent adults 1, 2
The American College of Physicians recommends initial treatment with ceftriaxone 2 g IV once daily PLUS ciprofloxacin 500 mg PO twice daily for immunocompromised adults/HIV patients until susceptibilities are available 1, 2, 4
The Centers for Disease Control and Prevention recommend avoiding fluoroquinolones in children and using alternative options such as TMP-SMX, ceftriaxone, or cefotaxime 3, 2, 4
The American College of Obstetricians and Gynecologists recommends avoiding fluoroquinolones in pregnant women and using alternative options such as ampicillin, ceftriaxone, or cefotaxime 3, 2, 4

The Infectious Diseases Society of America recommends TMP-SMX as an effective alternative if the organism is susceptible 1, 2, 4
The American College of Physicians recommends ceftriaxone 2 g IV once daily for severe infections or cephalosporin-susceptible strains 1, 2
The Society for Healthcare Epidemiology of America recommends amoxicillin 500 mg three times daily only if susceptibility is confirmed 1, 4

The American College of Physicians recommends treatment for 7-14 days for uncomplicated gastroenteritis (if treating) 2
The Infectious Diseases Society of America recommends treatment for minimum 14 days for bacteremia (immunocompetent) 1, 4
The Centers for Disease Control and Prevention recommend treatment for 14 days or longer if relapsing for bacteremia (immunocompromised) 4
The American College of Physicians recommends treatment for 2-6 weeks for advanced HIV (CD4+ <200) 1, 2

The Infectious Diseases Society of America recommends expecting persistent fever for 5-7 days despite appropriate therapy 1
The American College of Physicians defines treatment failure as lack of clinical improvement AND persistent positive blood cultures after completing therapy 1
The Society for Healthcare Epidemiology of America recommends evaluating for malabsorption of oral antibiotics, sequestered infection focus, or adverse drug reactions 1

The Centers for Disease Control and Prevention recommend long-term suppressive therapy (ciprofloxacin preferred) for HIV-infected patients with prior Salmonella septicemia 3, 1
The American College of Physicians recommends screening household contacts for asymptomatic carriage to prevent reinfection 3, 1

The Centers for Disease Control and Prevention recommends that for HIV-infected patients with prior Salmonella septicemia, long-term suppressive therapy with ciprofloxacin 500 mg twice daily for at least 2 months may be needed to prevent recurrence, and for recurrent Salmonella septicemia, consider 6 months or more of antibiotic treatment as secondary prophylaxis 5
The CDC also suggests that follow-up stool cultures are NOT generally required if complete clinical response is demonstrated, but consider repeat cultures for patients who fail to respond clinically or when public health considerations dictate, such as healthcare or food service workers 5
Treatment failure is defined as lack of clinical improvement AND persistent positive blood cultures after completing therapy, and when this occurs, evaluate for malabsorption of oral antibiotics, undrained abscess, adverse drug reactions interfering with antimicrobial activity, or co-infection with other organisms like C. difficile 5