Herpes simplex infections are confirmed in numerous ways. Typically, the appearance of the skin eruption is strongly suggestive. Viral cultures and rapid tests ( research into the crust and / or the liquid within the blister ) are available. The type of test for genital herpes that’s used relies on what the lesion looks like, or the morphology of the abrasion.
Acute vesicular lacerations, or fluid-filled blisters that are newly made, are more likely to react certainly to the fast assay. Older, crusted patches are better diagnosed as having viral culture. A viral culture is the most specific method of finding a genital herpes infection.
Another test for legions of genital herpes is the herpes virus antigen detection test. Cells from a fresh sore are scraped off and then smeared onto a microscope slide. This test uncovers markers ( called antigens ) on the outer layer of cells infected with the herpes pathogen. This test could be done with or in place of a viral culture.
Herpes simplex virus ( HSV ) infections may also be diagnosed between outbreaks by the use of a blood test.
Blood tests, which detect antibodies to HSV-1 or HSV-2 infection, can be helpful, though the results are not necessarily clear-cut. Herpes virus blood test can find antibodies that are made by the immune response to battle a herpes infection. Antibody tests are often done but are not as accurate as a viral culture at finding the root of a particular sore or ulcer. Antibody tests cannot notice the difference between a current active herpes infection and a herpes infection which happened in the past. Because antibodies take some time to develop after the first infection, an individual may not have a positive antibody test if the infection is recent. Some blood tests can tell the difference between HSV-1 and HSV-2.
A Polymerase Chain Reaction ( PCR ) test for genital herpes could also be ordered to diagnose HSV. A PCR test can be done on cells or fluid from a sore or on blood or on other fluid,eg spinal liquid. PCR finds the genetic material ( DNA ) of the HSV pathogen. This test can spot the difference between HSV-1 and HSV-2. The PCR test isn’t regularly done on skin sores, but it’s best for testing spinal fluid, for those rare cases in which herpes may lead to an infection in or around the brain.
In all cases, it is imperative to get enough viral cells for testing, and careful collection techniques are therefore significant. All crusts should be gently removed or vesicles gently unroofed. A sterile cotton swab pre-moistened in viral culture preservative is used to swab the base of the vesicle to obtain a specimen for analysis.
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