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A Modified EPA Method 1623 that Uses Tangential Flow Hollow-fiber Ultrafiltration and Heat Dissociation Steps to Detect Waterborne Cryptosporidium and Giardia spp.
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Emerging intestinal protozoa: a diagnostic dilemma

P A Collins1, M S Wright

  • 1University of Kentucky, Lexington 40536-0080, USA.

Clinical Laboratory Science : Journal of the American Society for Medical Technology
|August 5, 1997
PubMed

Insights

Cryptosporidium, Cyclospora, and microsporidia are emerging causes of severe diarrhea, particularly in immunocompromised individuals. Accurate laboratory diagnosis and physician communication are crucial for effective treatment and patient recovery.

Area of Science:

  • Medical Parasitology
  • Clinical Microbiology
  • Infectious Diseases

Background:

  • Cryptosporidium, Cyclospora, and microsporidia are increasingly identified in patients with severe diarrhea, especially those who are immunocompromised.
  • These protozoa have also been linked to waterborne outbreaks in immunocompetent individuals, highlighting their public health significance.
  • While Cryptosporidium and Cyclospora transmission routes are partially understood (fecal-oral via food/water), microsporidia transmission remains unclear.

Purpose of the Study:

  • To review the diagnostic challenges and clinical importance of Cryptosporidium, Cyclospora, and microsporidia.
  • To emphasize the need for improved laboratory detection methods for these protozoan pathogens.
  • To underscore the critical role of accurate diagnosis and interdisciplinary communication in patient management.

Main Methods:

  • Review of existing literature on the diagnosis and clinical presentation of Cryptosporidium, Cyclospora, and microsporidia.
  • Discussion of various microscopic and molecular diagnostic techniques, including wet mounts, acid-fast stains, trichrome stains, immunofluorescence, enzyme immunoassays, and polymerase chain reaction (PCR).
  • Emphasis on the requirement for skilled laboratory personnel for accurate pathogen identification.

Main Results:

  • Laboratory diagnosis of these protozoa is challenging and often not covered by routine screening.
  • Effective microscopic and molecular diagnostic methods exist but require expertise.
  • Accurate identification is essential as treatment varies significantly between genera.

Conclusions:

  • Early recognition and precise laboratory identification of Cryptosporidium, Cyclospora, and microsporidia are vital for immunocompromised and immunocompetent patients.
  • Advanced diagnostic techniques show promise but rely on trained professionals.
  • Close collaboration between clinical laboratories and physicians is paramount for successful patient treatment and outcomes.

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