Molecular characterization of Corynebacterium pseudotuberculosis isolates using ERIC-PCR.

Area of Science:

• Veterinary Microbiology
• Molecular Epidemiology
• Bacterial Typing

Background:

• Caseous lymphadenitis is a significant infectious disease in sheep and goats.
• Corynebacterium pseudotuberculosis causes caseous lymphadenitis, presenting as lymph node abscesses.
• Existing typing methods for C. pseudotuberculosis are often inadequate.

Purpose of the Study:

• To evaluate Enterobacterial Repetitive Intergenic Consensus PCR (ERIC-PCR) for molecular typing of C. pseudotuberculosis.
• To assess the discriminatory potential of ERIC-PCR for isolates from sheep in Brazil.

Main Methods:

• One hundred twenty-seven C. pseudotuberculosis isolates were collected from sheep lesions in Minas Gerais, Brazil.
• Molecular fingerprinting was performed using Random Amplified Polymorphic DNA (RAPD) with ERIC primers (ERIC-1R, ERIC-2, and ERIC-1R+ERIC-2).
• Genotyping and discriminatory power were assessed using the Hunter-Gaston Discrimination Index (HGDI).

Main Results:

• ERIC-PCR generated 17 to 21 distinct genotypes among the isolates.
• The HGDI values ranged from 0.69 to 0.87, indicating good discriminatory power.
• High correlation (W Kendall = 0.91) was observed among the different ERIC-PCR primer combinations.

Conclusions:

• ERIC-PCR is a valuable and effective tool for molecular typing of C. pseudotuberculosis in sheep.
• This method offers advantages over existing DNA-based typing techniques for epidemiological studies.
• The findings support the use of ERIC-PCR for discriminating C. pseudotuberculosis isolates in disease outbreak investigations.