Phenotypic and genotypic methods for the detection of herpes simplex virus serotypes

Area of Science:

• Virology
• Molecular Biology
• Epidemiology

Background:

• Accurate herpes simplex virus (HSV) serotyping is essential for understanding disease epidemiology and managing reactivation.
• Current typing methods can be labor-intensive or require specialized equipment.

Purpose of the Study:

• To develop and evaluate a polymerase chain reaction (PCR)-based restriction fragment length polymorphism (RFLP) assay for HSV serotyping.
• To compare the efficacy of PCR-RFLP with established methods like neutralization tests, allele-specific PCR, and DNA sequencing.

Main Methods:

• Developed a PCR-RFLP method using Hae III and Taq I restriction enzymes.
• Applied PCR-RFLP, neutralization test, allele-specific PCR, and DNA sequencing to standard HSV strains and clinical isolates.
• Utilized PCR-RFLP on culture-negative, PCR-positive clinical specimens.

Main Results:

• All applied typing methods concordantly differentiated 23 clinical isolates into 12 HSV-1 and 11 HSV-2.
• DNA sequencing confirmed no nucleotide variations within serotypes among the sequenced isolates.
• PCR-RFLP successfully typed 15 HSV-1 and 5 HSV-2 in 20 culture-negative specimens.

Conclusions:

• PCR-based RFLP is a reliable, less laborious, and cost-effective molecular tool for determining HSV serotypes.
• This method is effective for both clinical isolates and culture-negative specimens.
• The findings support the utility of PCR-RFLP in routine diagnostics and epidemiological studies of HSV.