Clinical Differences between Amebic and Bacterial Diarrhea

Características Clínicas Distintivas

The American College of Physicians suggests that amebic diarrhea tends to be persistent or chronic with visible blood in stool, while bacterial diarrhea is more acute with higher fever and more pronounced systemic symptoms 1, 2
Amebic diarrhea is characterized by a persistent or chronic presentation, lasting weeks or months, with visible blood, mucus, and a semiliquid consistency in stool 1, 2, 3
Bacterial diarrhea is generally acute, with a rapid onset, and is characterized by visible blood in stool, especially in infections caused by STEC, Shigella, Salmonella, and Campylobacter 1, 2
The Infectious Diseases Society of America recommends that patients with bacterial diarrhea be evaluated for systemic manifestations, including signs of septicemia 4
The Centers for Disease Control and Prevention suggest that dysentery syndrome, characterized by frequent and scanty stools with blood, fever, abdominal cramps, and tenesmus, is especially common in shigellosis 5

The American College of Physicians recommends that bacterial diarrhea be diagnosed using stool culture, which is a traditional method for identifying bacterial pathogens such as Salmonella, Shigella, Campylobacter, and Yersinia 1, 6
Molecular multiplex tests can detect multiple bacterial pathogens simultaneously 7
Blood cultures are indicated in infants <3 months, people with signs of septicemia, or enteric fever 6
Toxin detection is especially important for STEC and C. difficile 1

The Infectious Diseases Society of America recommends that empirical antibiotic treatment not be used in immunocompetent patients with bloody diarrhea while awaiting investigation results 5
Exceptions to this recommendation include infants <3 months with suspected bacterial etiology, immunocompetent individuals with documented fever, abdominal pain, bloody diarrhea, and presumed bacillary dysentery due to Shigella 5
The American College of Physicians suggests that fluoroquinolones, such as ciprofloxacin or azithromycin, be used in adults, and third-generation cephalosporins or azithromycin in children 4
Antibiotics should be avoided in infections caused by STEC O157 and other STEC producers of Shiga toxin 2 due to the risk of hemolytic uremic syndrome 5

The Centers for Disease Control and Prevention recommend that infants <3 months be considered at higher risk for bacterial diarrhea 6
Food exposures, such as consuming contaminated food or water, increase the risk of bacterial diarrhea 9
International travel, especially to areas with poor hygiene, increases the risk of bacterial diarrhea 4
Community outbreaks, where multiple people share a common meal, increase the risk of bacterial diarrhea 7

The Infectious Diseases Society of America warns that hemolytic uremic syndrome is a complication of bacterial diarrhea, especially in infections caused by STEC 5
Bacteremia is more common in infections caused by Salmonella 6
Reactive arthritis is especially common in infections caused by Campylobacter, Salmonella, and Yersinia 2
Guillain-Barré syndrome is associated with Campylobacter infection 2