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Herpes simplex virus
The Herpes simplex virus infection (common names: herpes, cold sores) is a common, contagious, incurable, and in some cases sexually transmitted disease caused by a double-stranded DNA virus.| Table of contents |
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2 Course of outbreak 3 Transmission 4 HSV-1 and HSV-2 5 Prevalence 6 Prevention 7 Treatments 8 Long-term effects 9 Myths 10 Other herpesviruses 11 External Links |
Symptoms
The most obvious symptom of herpes is blisters anywhere on the body, but especially near the mouth or genital areas. Some people may experience prodromal symptoms: tingling, pain, burning, or itching in the area a few days before the blisters appear. The period from the time the blisters appear until the sores heal is known as an active outbreak.Course of outbreak
The ways in which herpes infections manifest themselves vary tremendously among individuals. Following are general descriptions of the courses outbreaks may take in the oral and genital regions."Oral" infections
- Prodromal symptoms
- Skin appears irritated
- Sore or cluster of fluid-filled blisters appear
- Lesion begins to heal, usually without scarring
"Genital" infections
- Prodromal symptoms
- Sore appears
- Lesion begins to heal, usually without scarring
The appearance of herpes lesions and the experience of outbreaks in these areas varies tremendously among indivuals. Herpes lesions on/near the genitals may look like cold sores. They may not. An outbreak may look like a paper cut, or chafing, or appear to be a yeast infection. Symptoms of a genital outbreak may include aches and pains in the area, discharge from the penis or vagina, and discomfort when urinating.
Initial outbreaks are usually more severe than subsequent ones, and generally also involve flu-like symptoms and swollen glands for a week or so. Subsequent outbreaks tend to be periodic or episodic, typically occur four to five times a year, and can be triggered by stress, illness, fatigue, menstruation, and other changes. The virus sequesters in the nerve endings (where the blisters were) during non-eruptive periods, where it cannot be conventionally eliminated by the body's immune system. The blisters can spread to any part of the body, and can cause damage if spread to the eyes.
Transmission
Herpes is contracted through direct skin contact (not necessarily in the genital area) with an infected person. The virus travels through tiny breaks in the skin or through moist areas, but symptoms may not appear for at least a month after infection. Transmission is most common during an active outbreak.HSV-1 and HSV-2
There are two main kinds of herpes simplex virus; types 1 (HSV-1) and 2 (HSV-2). Both types of HSV can infect either the oral or genital regions. It is easier to acquire an HSV-1 infection in the oral region, and for most people with HSV-1, that is where outbreaks occur. It is easier to acquire an HSV-2 infection in the genital region, and for most people with HSV-2, that is where outbreaks occur.The terminology of herpes can be quite confusing; the two viruses are sometimes referred to by the sites they preferentially infect. Thus, HSV-1 can be called "oral herpes," (or sometimes "cold sores") and HSV-2 can be called "genital herpes." However, it is perfectly possible to have an HSV-1 infection of the genitals, or an HSV-2 infection of the oral area.
Another factor adds to the confusion; herpes is also sometimes described by the site of the infection. Thus, a herpes infection located in the genital region may be called "genital herpes," and a herpes infection located in the oral region may be called "oral herpes," irrespective of which virus is actually present.
People whose herpes infections are not located in the virus' "preferred" location may experience fewer, less severe outbreaks. For example, if Alfred has an HSV-1 infection of the mouth, and Bill has an HSV-1 infection of the genitals, Alfred is likely to experience more frequent and/or severer outbreaks than Bill.