A validated method to identify Echinococcus granulosus sensu lato at species level

Area of Science:

• Veterinary Parasitology
• Molecular Biology
• Public Health

Background:

• Cystic echinococcosis, caused by Echinococcus granulosus sensu lato (s.l.), is a significant neglected tropical disease.
• The E. granulosus (s.l.) species complex comprises at least eight genotypes across five species, varying in public health importance.
• Accurate species identification is critical for understanding disease transmission and impact.

Purpose of the Study:

• To develop and validate a molecular method for identifying E. granulosus (s.l.) species.
• To differentiate the common E. granulosus sensu stricto (s.s.) (G1, G3) from other species within the complex.
• To provide a reliable tool for diagnostic laboratories.

Main Methods:

• Development of a two-step molecular assay: PCR-restriction fragment length polymorphism (PCR-RFLP) for E. granulosus sensu stricto (s.s.) and multiplex PCR for other species.
• Application of the method to DNA extracted from human and animal parasitic cyst material.
• Validation according to ISO/IE 17025 standards at the European Union Reference Laboratory for Parasites (EURLP).

Main Results:

• The developed method successfully identified E. granulosus sensu stricto (s.s.) (genotypes G1 and G3) using PCR-RFLP.
• The multiplex PCR assay effectively identified the remaining E. granulosus (s.l.) species.
• The method demonstrated applicability to DNA from various sample types (ethanol-preserved or frozen cyst material).

Conclusions:

• A robust and validated molecular diagnostic method for E. granulosus (s.l.) species identification is presented.
• This assay facilitates accurate diagnosis and genotyping of cystic echinococcosis causative agents.
• The method supports improved epidemiological surveillance and control strategies for this neglected tropical disease.