Both HSV-1, and HSV-2 can be the cause of herpetic gingivostomatitis, although HSV-1 is the source of infection in around 90% of cases.Herpetic gingivostomatitis infections can present as acute or recurrent. Acute infection refers to the first invasion of the virus, and recurrent is when reactivation of the latent virus occurs. Acute herpetic gingivostomatitis primarily occurs in children, particularly of those under the age of six years old.On external surfaces the virus is short lived, however it is extremely contagious. Most people acquire the virus via direct contact, it can enter the body by disrupting the integrity of skin, mucous membranes or enter via infected secretions such as saliva. The virus replicates once it has penetrated the epithelial cell, then it travels to the corresponding nerve ganglion (i.e. trigeminal ganglion) via sensory nerves endings. At the nerve ganglion the virus enters a latent phase and remains dormant until it is reactivated. Reactivation can be spontaneous or stimulated by a number of factors such as: reinfection by direct effect of stimuli, immunosuppression, ultraviolet light, febrile illnesses and stress. Risk factors
Age: Primary herpetic gingivostomatitis is common in children from 6 months to 5 years old. This virus is also common in young adults aged around 20–25.Immune system: The prevalence and severity of the disease is dependent on the hosts immune response and the virulence of the virus. Environment: As this virus is very contagious it has the potential to spread quickly in enclosed environments e.g.
Tarka may refer to:

Tarka, also Chhaunk, in Indian cuisine is a method of seasoning food with spices heated in oil or ghee
Tarka, Nigeria, a Local Government Area in Benue State, Nigeria
Tarka, Niger
Tarka the Otter, a 1927 novel by Henry Williamson
Tarka Line, a railway line in Devon, England
Tarka Trail, a series of footpaths assembled from former railway lines
Tarka (medication), a brand name for an antihypertensive medication
Tarka (flute), also tharqa, a traditional flute of the Andes
David Tarka (born 1983), Australian football player
Taharqa, Nubian pharaoh of the twenty-fifth Dynasty of Egypt
Tarka (film), a 1988 Kannada language movie
Taarka, an Oregonian quartet
Tarka Cordell (1968–2008), British musician, writer and record producer
Wiesław Tarka (born 1964), Polish diplomat
The Tarka, an alien race in the video game Sword of the Stars

See also
Tarka sastra, an Indian science of dialectics, logic and reasoning