How Herpes Is Transmitted: Is It Contagious and How to Protect Yourself

In 1912, Grüter described a virus that is now familiar to almost everyone: 80–90% of adults have antibodies to herpes simplex virus in their blood. Behind this dry number lies a long history of human-microbe coexistence — and a very practical question that everyone asks themselves after seeing a characteristic blister on a loved one.

Is Herpes Contagious

Yes, and it is contagious longer than it seems. With a "cold sore" on the lips, the virus is shed from the moment of the first tingling, itching, or burning — even before blisters appear — and until complete healing. A person without visible eruptions can also be a source of infection: some people carry the virus asymptomatically. The virus can remain active outside the body — according to various estimates, on dry surfaces from 2 hours to several weeks, although it is easily destroyed by disinfectants.

How Herpes Is Transmitted: Main Routes

Herpes simplex virus is transmitted primarily by contact: with fluid from blisters, with saliva during kissing, with vaginal secretions during sexual contact, and also through household items. Less common are airborne transmission, transmission through the placenta, and infection of a child during birth. There are two types of the virus: HSV-1 more often causes eruptions around the mouth and on the face, HSV-2 — genital herpes, although each of them can also affect the "other" area. After infection, the virus remains in the skin and nerve ganglia for life.

Is Herpes Transmitted Through Kissing

It is transmitted, and this is one of the most common mechanisms. Most people encounter the virus in childhood — after close skin-to-skin contact, for example when kissing a person who has an eruption. Hence a simple rule: until the herpes on the lips has fully healed, do not kiss. Doctors separately warn about kissing infants: in newborns, herpes is very dangerous.

Is Herpes on the Lips and Body Contagious

Eruptions on the lips are contagious throughout — from tingling to healing, and the virus is easily transferred to other areas of one's own body. Genital herpes is a sexually transmitted infection and is also contagious. Less often, herpes affects the eyes, skin, and other areas. Carriage is lifelong: in most people, exacerbations occur several times a year, and over time — less often.

Why Herpes Is Dangerous

In a healthy adult, a "cold sore" on the lips usually heals on its own within 10 days. The danger increases in newborns and people with weakened immunity — there the virus can be severe. Exacerbations are triggered by illness, fever, stress, injuries, menstruation, and sun.

• the blisters have not begun to heal within 10 days;
• the eruption is very large or very painful;
• you or your child have swollen and painful gums, or ulcers have appeared in the mouth;
• immunity is weakened, for example due to chemotherapy or diabetes.

Herpes Prevention: How to Reduce the Risk of Infection

The measures are simple and based on the mechanism of transmission. Wash your hands with soap after touching the eruption, do not kiss anyone until the herpes has healed, and avoid oral sex until complete healing — otherwise the partner may get genital herpes. Do not touch the blister unnecessarily. The doctor assesses severity, prescribes examinations, and in case of frequent exacerbations decides on assistance.

The eruption itself is not a reason to call an ambulance; 103/112 — for a life-threatening condition, including in a newborn or a person with weakened immunity.

This article is for reference: it explains the mechanism but does not replace consultation with a doctor who sees the specific person.

This content is for reference and does not replace a doctor's consultation. Medical disclaimer