Related Experiment Videos
Diagnosis of Cryptosporidium parvum in patients with severe diarrhea and AIDS
P D Greenberg1, J Koch, J P Cello
1Division of Gastroenterology, Hepatology, and Clinical Nutrition, San Francisco General Hospital, California 94110, USA.
Abstract:
The sensitivity of noninvasive stool microscopy and endoscopic biopsies from the upper and lower gastrointestinal tract in the diagnosis of Cryptosporidium parvum in patients with AIDS is not known. We evaluated 30 severely immunocompromised patients with AIDS and diarrhea caused by C. parvum. C. parvum was diagnosed by either stool microscopy, endoscopic biopsy, or both. Patients submitted a mean (+/-SEM) of 3.3 +/- 0.3 stool samples, each microscopically evaluated for ova and parasites. Upper and lower endoscopy were performed in all patients and endoscopic biopsies were taken throughout the gastrointestinal tract. Diarrhea had been present for a mean of 13.5 +/- 2.3 months and mean daily stool weight was 1224 +/- 127 g. Overall, individual stool samples were insensitive, as only 53% demonstrated C. parvum. When multiple stool samples were considered for each patient, 73% of subjects demonstrated C. parvum in at least one stool sample. The sensitivity of endoscopy with mucosal biopsy varied by anatomical location: stomach (11%), duodenum (53%), terminal ileum (91%), and colon (60%). The terminal ileum was significantly more likely than the duodenum to demonstrate C. parvum (P = 0.03). Thus, duodenal biopsies are much less sensitive than those from the terminal ileum in the diagnosis of C. parvum. In AIDS patients with diarrhea undergoing colonoscopy, intubation of the terminal ileum should be performed when feasible. Although individual stool samples are insensitive in detecting C. parvum, the diagnostic yield is improved by the collection of multiple samples.
Insights
Diagnosing Cryptosporidium parvum in AIDS patients with diarrhea is challenging. Endoscopic biopsies, particularly from the terminal ileum, are more sensitive than stool microscopy for detecting this infection.
Area of Science:
- Medical Microbiology
- Infectious Diseases
- Gastroenterology
Background:
- Cryptosporidium parvum is an opportunistic pathogen causing significant morbidity in patients with Acquired Immunodeficiency Syndrome (AIDS).
- Accurate and timely diagnosis is crucial for effective management of cryptosporidiosis in immunocompromised individuals.
Purpose of the Study:
- To compare the diagnostic sensitivity of noninvasive stool microscopy and endoscopic biopsies from various gastrointestinal tract locations for Cryptosporidium parvum in patients with AIDS.
Main Methods:
- Evaluated 30 severely immunocompromised patients with AIDS and diarrhea attributed to C. parvum.
- Collected and microscopically examined multiple stool samples per patient.
- Performed upper and lower endoscopies with biopsies from the stomach, duodenum, terminal ileum, and colon.
Main Results:
- Individual stool samples showed low sensitivity (53%), with improved detection (73%) when multiple samples were analyzed.
- Endoscopic biopsy sensitivity varied by location: stomach (11%), duodenum (53%), terminal ileum (91%), and colon (60%).
- The terminal ileum demonstrated significantly higher sensitivity for C. parvum detection compared to the duodenum (P = 0.03).
Conclusions:
- Endoscopic biopsies, especially from the terminal ileum, are more sensitive than stool microscopy for diagnosing C. parvum in AIDS patients with diarrhea.
- Intubation of the terminal ileum during colonoscopy is recommended when feasible for improved diagnostic yield.
- Collecting multiple stool samples enhances the detection rate of C. parvum compared to single samples.