Treatment of Gastroenteritis with Shigella and EIEC

Antibiotic Therapy

The Infectious Diseases Society of America recommends treating Shigella and EIEC infections with antibiotics immediately, using either azithromycin or a fluoroquinolone in adults, based on local resistance patterns and travel history 1, 2
For children, azithromycin is the preferred treatment for Shigella infections 2
The American Academy of Pediatrics recommends using a third-generation cephalosporin, such as ceftriaxone, for infants under 3 months of age or children with neurologic involvement 1, 2

Before initiating antibiotics, it is essential to rule out Shiga toxin-producing E. coli (STEC) infection, as antibiotics can increase the risk of hemolytic uremic syndrome (HUS) 1, 2, 6
If STEC is detected or suspected, antibiotics should be avoided entirely 1, 2, 6

The World Health Organization recommends using reduced osmolarity oral rehydration solution (ORS) as the first-line treatment for mild to moderate dehydration 7, 1, 8
Intravenous isotonic fluids, such as lactated Ringer's or normal saline, should be used for severe dehydration, shock, or altered mental status 1, 8

Immunocompromised patients should have a lower threshold for empiric antibacterial treatment, especially if they have severe illness and bloody diarrhea 1, 5, 8
Infants under 3 months of age should be treated empirically with a third-generation cephalosporin due to the risk of bacteremia and neurologic complications 1, 2

Patients with frequent scant bloody stools, fever, abdominal cramps, and tenesmus are likely to have bacillary dysentery and should be treated with antibiotics immediately 1, 5, 4