Ophthalmologic Manifestations of Herpes Simplex Keratitis
- Author: Jim C Wang, MD; Chief Editor: Hampton Roy Sr, MD more...
Background
Herpes simplex virus (HSV) keratitis encompasses a variety of disease processes that HSV can cause in the human cornea.
Herpes simplex virus dendritic ulcer stained with rose bengal. A variety of clinical manifestations of infectious and immunologic etiologies, such as infectious epithelial keratitis, neurotrophic keratopathy, necrotizing stromal keratitis, immune stromal keratitis (ISK), and endotheliitis, can affect all levels of the cornea.
Neurotrophic keratopathy.
Active immune stromal keratitis. Although more common as a manifestation of recurrent HSV infection, HSV keratitis may also be seen during a primary infection.
Pathophysiology
HSV is a DNA virus that commonly affects humans. Infection occurs by direct contact of skin or mucous membrane with virus-laden lesions or secretions. HSV type 1 (HSV-1) is primarily responsible for orofacial and ocular infections, whereas HSV type 2 (HSV-2) generally is transmitted sexually and causes genital disease. HSV-2 may rarely infect the eye by means of orofacial contact with genital lesions and occasionally is transmitted to neonates as they pass through the birth canal of a mother with genital HSV-2 infection.
Primary HSV-1 infection occurs most commonly in the mucocutaneous distribution of the trigeminal nerve. It is often asymptomatic but may manifest as a nonspecific upper respiratory tract infection. After the primary infection, the virus spreads from the infected epithelial cells to nearby sensory nerve endings and is transported along the nerve axon to the cell body located in the trigeminal ganglion. There, the virus genome enters the nucleus of a neuron, where it persists indefinitely in a latent state. Primary infection of any of the 3 (ie, ophthalmic, maxillary, mandibular) branches of cranial nerve V can lead to latent infection of nerve cells in the trigeminal ganglion. Interneuronal spread of HSV within the ganglion allows patients to develop subsequent ocular disease without ever having had primary ocular HSV infection.[1]
Recurrent ocular HSV infection has traditionally been thought of as reactivation of the virus in the trigeminal ganglion, which migrates down the nerve axon to produce a lytic infection in ocular tissue. Evidence suggests that the virus may also subsist latently within corneal tissue, serving as another potential source of recurrent disease and causing donor-derived HSV disease in transplanted corneas. However, corneal HSV latency as a cause of recurrent disease remains controversial.
A prospective multicenter trial failed to find an association between anecdotal environment triggers (eg, stress, systemic infections, sunlight exposure, menstruation, contact lens wear, eye injury) and ocular HSV recurrence.[2, 3, 4]
Epidemiology
Frequency
United States
Approximately 20,000 new cases of ocular HSV occur in the United States annually, and more than 28,000 reactivations occur in the United States annually. It is one of the most frequent causes of blindness in the United States with 500,000 people experiencing HSV-related ocular disease.
International
HSV infection is ubiquitous, with an estimated one third of the population worldwide suffering from recurrent infections.
Mortality/Morbidity
HSV keratitis is the most frequent cause of corneal blindness in the United States and is a leading indication for corneal transplantation. HSV keratitis is also the most common cause of infectious blindness in the Western world.
Age
Most HSV eye disease occurs in adults, and it occurs many years after the primary infection. However, herpetic keratitis in children almost always involves the corneal epithelium and is marked by a disproportionate risk of binocular disease, a high recurrence rate, and amblyopia.[5]
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