Echinococcosis Research Reveals Diagnostic Performance Gaps

Strategic Insights -

New research on echinococcosis, a parasitic disease caused by the Echinococcus tapeworm, highlights the limitations of a widely used diagnostic test. According to a study published in Ankara Universitesi Tip Fakultesi Mecmuas, the indirect hemagglutination test (IHAT) has a low positivity rate in patients with cystic lesions identified on radiological imaging, indicating that it may not be sufficient for routine laboratory tests.

Researchers from Ankara University Faculty of Medicine evaluated the diagnostic performance of IHAT in 636 patients with suspected cystic echinococcosis (CE). They found that the positivity rate was 5.97%, with the highest positivity percentage (19%) in patients aged 0-19. The study also showed that patients with CE-specific findings identified on radiological imaging had a higher seropositivity rate (39.6%) than those without cysts detected on imaging (11.9%).

Key Takeaways:

  • The indirect hemagglutination test (IHAT) has a low positivity rate in patients with cystic lesions identified on radiological imaging.
  • The highest positivity percentage (19%) was found in patients aged 0-19.
  • Patients with CE-specific findings identified on radiological imaging had a higher seropositivity rate (39.6%) than those without cysts detected on imaging (11.9%).
  • The seropositivity rate of IHAT was found to be low in patients with CE lesions identified on radiological imaging.
  • The patient group with cystic lesions apparent in radiological imaging had the greatest seropositivity rate (11.9%).
  • The seronegativity rate was found to be 95.7% in patients with no cysts detected on radiological imaging.
  • Ozlem Ulusan Bagci, Ankara University Faculty of Medicine Department of Parasitology, states that using a second serological test together with IHAT may increase analytical sensitivity in routine laboratory tests.

Statistics:

  • 636 patients were evaluated in the study.
  • The positivity rate of IHAT was found to be 5.97%.
  • The age-group differences in CE seropositivity were statistically significant (p=0.011).
  • The seropositivity rate of IHAT in patients with CE-specific findings identified on radiological imaging was 39.6% when the threshold value was taken as 1/80.

Sources:

  • Evaluation of the Diagnostic Performance of the Indirect Hemagglutination Test in the Differential Diagnosis of Cystic Echinococcosis: Single Center Experience. Ankara Universitesi Tip Fakultesi Mecmuas, 2025,78(1):69-75.
  • doi: 10.4274/atfm.galenos.2025.27048 (free version available at https://doi-org.sdpl.idm.oclc.org/10.4274/atfm.galenos.2025.27048)
  • NewsRx. Research from Ankara University Faculty of Medicine Broadens Understanding of Echinococcosis (Evaluation of the Diagnostic Performance of the Indirect Hemagglutination Test in the Differential Diagnosis of Cystic Echinococcosis: Single Center ...). Health & Medicine Week. August 8, 2025; p 3955.