Prevalence and Incidence of Herpes
Prevalance of types of Herpes:
For details see prevalence of types of Herpes analysis; summary of available prevalence data:
Herpes Prevalence: Book Excerpts
Incidence of types of Herpes:
For details see incidence of types of Herpes analysis; summary of available incidence by type data:
Prevalence/Incidence of Herpes: Online Medical Books
16 MEDICAL BOOKS ONLINE!
Review excerpts from medical books online, free, without registration,
for more information about the prevalence and/or incidence of Herpes.
Herpes simplex:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
About 85% of all HVH infections are subclinical; the others produce localized lesions and systemic reactions. After the first infection, a patient is a carrier susceptible to recurrent infections, which may be provoked by fever, menses, stress, heat, and cold. However, the patient usually has no constitutional signs and symptoms in recurrent infections.
Primary HVH is the leading cause of childhood gingivostomatitis in children ages 1 to 3. It causes the most common form of nonepidemic encephalitis and is the second most common viral infection in pregnant women. It can pass to the fetus transplacentally and, in early pregnancy, may cause spontaneous abortion or premature birth.
Herpes infection is equally common in males and females. Worldwide in distribution, it's most prevalent among children in lower socioeconomic groups who live in crowded environments. Saliva, stool, skin lesions, purulent eye exudate, and urine are potential sources of infection.
» READ BOOK EXCERPT ONLINE »
Source: Professional Guide to Diseases (Eighth Edition), 2005
Herpes zoster:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
Herpes zoster results from reactivation of varicella virus that has lain dormant in the cerebral ganglia (extramedullary ganglia of the cranial nerves) or the ganglia of posterior nerve roots since a previous episode of chickenpox. Exactly how or why this reactivation occurs isn’t clear. Some believe that the virus multiplies as it's reactivated and that antibodies remaining from the initial infection neutralize it. However, if effective antibodies aren't present, the virus continues to multiply in the ganglia, destroy the host neuron, and spread down the sensory nerves to the skin.
Herpes zoster occurs primarily in adults, especially those older than age 50. It seldom recurs. It's also seen in patients with human immunodeficiency virus and other immunodeficiency disorders.
» READ BOOK EXCERPT ONLINE »
Source: Professional Guide to Diseases (Eighth Edition), 2005
Genital herpes:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
Genital herpes is usually caused by infection with herpes simplex virus Type 2, but some studies report increasing incidence of infection with herpes simplex virus Type 1. This disease is typically transmitted through sexual intercourse, orogenital sexual activity, kissing, and hand-to-body contact. Pregnant women may transmit the infection to neonates during vaginal delivery if an active infection is present. Such transmitted infection may be localized (for instance, in the eyes) or disseminated and may be associated with central nervous system involvement.
An estimated 86 million people worldwide are thought to have genital herpes.
» READ BOOK EXCERPT ONLINE »
Source: Professional Guide to Diseases (Eighth Edition), 2005
Herpes Simplex Virus:
Herpes Simplex Virus - epidemiology
(The 5-Minute Pediatric Consult)
- Neonatal infection is usually acquired from the maternal genitourinary tract and causes serious disease with high mortality and morbidity.
- HSV-1 usually causes infections of the upper torso, head, and neck.
- HSV-2 usually causes genital infection. However, both forms can infect oral or genital cells, thus the virus type is not a reliable indicator of the anatomic site of infection.
- Route of spread is usually by close bodily contact or trauma such as teething or a break in the skin.
- Incubation period is 2–12 days (~6 days).
- Neonatal HSV infections are acquired from maternal strains, and 75–85% are caused by HSV-2.
- After the neonatal period, HSV-1 infections predominate, and 40–60% of children are seropositive for HSV-1 by the age of 5 years.
Herpes Simplex Virus - prevalence
During puberty and early adolescence, the prevalence of HSV-2 increases, and 20–35% of adults are seropositive for HSV-2.
» READ BOOK EXCERPT ONLINE »
Source: The 5-Minute Pediatric Consult, 2008
About prevalence and incidence statistics:
The term 'prevalence' of Herpes usually refers to the estimated population
of people who are managing Herpes at any given time.
The term 'incidence' of Herpes refers to the annual diagnosis rate,
or the number of new cases of Herpes diagnosed each year.
Hence, these two statistics types can differ:
a short-lived disease like flu can have high annual incidence but low prevalence,
but a life-long disease like diabetes has a low annual incidence but high prevalence.
For more information see about prevalence and incidence statistics.
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