Genital Herpes

Genital herpes is a sexually transmitted infection primarily caused by herpes simplex virus type 2 (HSV-2), though herpes simplex virus type 1 (HSV-1) is increasingly implicated in genital infections, particularly among younger populations. Transmission occurs mainly through sexual contact, with asymptomatic viral shedding serving as a major route of spread. This characteristic makes HSV-2 difficult to control at a population level, as individuals may unknowingly transmit the virus even in the absence of clinical symptoms. Globally, HSV-2 infection is highly prevalent, with an estimated 13% of the worldwide population aged 15–49 affected, according to the World Health Organization.

Clinical Course and Diagnosis

Primary HSV-2 infections are usually more severe than recurrent episodes and may present with systemic symptoms such as fever, malaise, dysuria, and lymphadenopathy in addition to painful vesicular lesions. Diagnosis can be confirmed using polymerase chain reaction (PCR), viral culture, or serological testing for HSV-specific antibodies. PCR is the most sensitive method and is preferred in clinical practice.

Latency, Recurrence, and Immune Response

After primary infection, HSV-2 establishes latency in the sacral dorsal root ganglia. During latency, the virus persists in a transcriptionally silent state but can reactivate in response to stress, immune suppression, or hormonal fluctuations. Recurrences vary among individuals, with some experiencing frequent outbreaks and others only rare reactivations. Host immunity, particularly cell-mediated responses, plays a crucial role in controlling viral replication and limiting the frequency of relapses.

Complications and Public Health Considerations

Complications of genital herpes include increased susceptibility to other sexually transmitted infections, particularly human immunodeficiency virus (HIV), as the mucosal disruption and inflammatory environment facilitate viral entry. In immunocompromised individuals, HSV-2 infections can be more severe and disseminated. Antiviral therapies such as acyclovir, valacyclovir, and famciclovir reduce the severity and duration of outbreaks but do not eradicate the latent virus. Suppressive therapy with daily antivirals can decrease recurrence frequency and lower the risk of transmission to sexual partners, making it an important public health strategy.