Diagnostic Approach for Genital Herpes

Diagnostic Tests

The American College of Physicians recommends nucleic acid amplification tests (NAATs) such as PCR as the first-line diagnostic test for HSV detection in patients with active genital lesions due to their superior sensitivity and specificity compared to other methods 1
The European Centre for Disease Prevention and Control suggests that NAAT/PCR is the first choice for diagnosing genital herpes, offering the highest sensitivity (11-71% superior to viral culture) and allowing simultaneous detection and typing of HSV-1 and HSV-2 in a single reaction 2
The Centers for Disease Control and Prevention recommend viral culture as the second choice for diagnosing genital herpes if NAAT is unavailable, but it has lower sensitivity 1, 3
The European Centre for Disease Prevention and Control advises against using direct immunofluorescence assay and Tzanck smear for diagnosis due to their lack of sensitivity 1

The European Centre for Disease Prevention and Control recommends sampling fluid from intact vesicles or the base of ulcers for NAAT or antigen detection 2, 4
The European Centre for Disease Prevention and Control suggests using urethral swabs for NAAT or antigen detection in male patients 2
The European Centre for Disease Prevention and Control recommends using cervical/urethral swabs for NAAT or antigen detection in female patients 2

The American College of Physicians emphasizes that HSV typing is essential for counseling and prognosis, as differentiation between HSV-1 and HSV-2 is important 1
The European Centre for Disease Prevention and Control notes that up to 50% of first-episode genital herpes cases are caused by HSV-1 5
The European Centre for Disease Prevention and Control states that recurrences and subclinical viral shedding are less frequent with genital HSV-1 than HSV-2 5
The European Centre for Disease Prevention and Control warns that serological testing has limitations, including the inability to determine the etiology of a presenting genital lesion with certainty 5, 6
The American College of Physicians advises that widespread screening for HSV antibodies is not recommended 1, 5

The European Centre for Disease Prevention and Control notes that NAAT allows less strict sample transportation conditions compared to viral culture 7
The European Centre for Disease Prevention and Control recommends that samples for viral culture should be transported to the laboratory on ice and processed within 24 hours 8
The American College of Physicians warns against relying solely on clinical diagnosis without laboratory confirmation and using HSV molecular assays in the absence of genital ulcers 1

The US Preventive Services Task Force recommends against screening for HSV-2 infection among asymptomatic adolescents and adults 9

The US Preventive Services Task Force recommends against screening for HSV-2 infection among asymptomatic adolescents and adults, and type-specific serology should be used for detecting asymptomatic infections in high-risk individuals, including pregnant women at risk of acquiring HSV close to delivery 9

Patients with genital herpes should be counseled about the natural history of the disease, potential for recurrent episodes, asymptomatic viral shedding, and sexual transmission risk, and patients should be advised to abstain from sexual activity while lesions are present, and condom use should be encouraged during all sexual exposures 10
The same medication dosages are recommended for both HSV-1 and HSV-2 genital infections 9
Type-specific testing can identify asymptomatic HSV-2 infections, which is important as many cases are transmitted during asymptomatic periods 10
In HIV-infected persons, intermittent or suppressive therapy with oral acyclovir may be needed at increased dosages 10