Herpes: Virus Types, Genital and Shingles, and Testing

Many people link the word "herpes" only with blisters on the lip, but it is actually a whole family of viruses that affect different organs and behave differently. They share one trait: once in the body, a herpesvirus stays for life and reactivates from time to time. Here is what types of herpes virus exist, why genital herpes and shingles matter, and which tests help make sense of it.

What Herpes Is and What Virus Types Exist

Herpesviruses are a large group of DNA viruses that can hide in nerve or immune cells in a latent (dormant) state. That is why they cannot be fully "cleared" from the body: between flare-ups the virus does not disappear but waits for immunity to drop. Eight herpesvirus types matter in humans, but a few come up most often.

Herpes Simplex Virus Types 1 and 2

Herpes simplex virus comes in two types. HSV-1 usually causes a cold sore on the lip, HSV-2 more often genital herpes, though both types can affect any site. Both spread through direct contact, including when there are no lesions (asymptomatic shedding) — which is why the virus is so widespread.

Genital Herpes: Key Points

Genital herpes is a sexually transmitted infection: painful blisters and sores in the genital area, itching, sometimes fever during the first episode. It is one of the STIs, so both partners are assessed when it is suspected. Special care is needed in pregnancy: a primary infection late in pregnancy is dangerous for the newborn, and the mode of delivery is decided with a doctor.

Shingles (Herpes Zoster)

Shingles is caused by the varicella-zoster virus — the same one that causes chickenpox. After childhood chickenpox the virus sleeps in nerve clusters for decades and, when immunity falls, "wakes up" to cause a painful rash in a band along a nerve, usually on one side of the trunk. The pain can be severe and sometimes persists after healing. Shingles is more common in adults and older people.

Other Herpesviruses: EBV, CMV, HHV-6

The family also includes viruses that do not cause the usual "blisters". Epstein-Barr virus causes infectious mononucleosis; like cytomegalovirus, it is checked by antibodies — EBV and CMV. Both matter in pregnancy and in people with weakened immunity. Human herpesvirus 6 causes roseola in children — high fever followed by a rash.

Herpes Symptoms and When It Is Dangerous

Presentation depends on the type: blisters on the lips or genitals, a painful banded rash, or fever and rash in children. Situations that need a doctor: herpes in pregnancy and in immunodeficiency, eye involvement, extensive or non-healing lesions, severe pain in shingles, and frequent recurrences (more than six a year).

Which Herpes Tests Are Used

In typical cases the diagnosis is made from the look of the lesions. Tests are needed in doubtful situations and risk groups: PCR of blister fluid (identifies the virus and its type), IgG and IgM antibodies in the blood (IgG indicates past contact, IgM a recent infection or flare). In severe disease a complete blood count is ordered. With frequent recurrences it is sensible to check immune status. If you have a confusing antibody report, you can upload it for decoding.

Treatment and Whether It Can Be Cured

The virus cannot be removed from the body, but antivirals shorten a flare, speed healing and reduce recurrence frequency — especially when started at the very beginning. For frequent flares a doctor may prescribe long-term preventive treatment. In shingles, early treatment is important to lower the risk of lingering pain; a vaccine exists to prevent it in older adults.

When to See a Doctor

See a doctor for genital lesions, shingles (especially with facial or eye involvement), herpes during pregnancy, in immunodeficiency, and if lesions are extensive, non-healing or recur often. If you are unsure about the nature of a rash, you can describe the symptoms — the service suggests likely causes and which specialist to see.

This article is for informational purposes only and does not replace a doctor's consultation. Diagnosis and treatment are determined by a specialist.