Herpes simplex infections are confirmed in several ways. Typically, the appearance of the skin eruption is strongly suggestive. Viral cultures and fast tests ( analysis of the crust and / or the liquid within the blister ) are available. The sort of test for genital herpes that is used relies on what the lesion looks like, or the morphology of the lesion.
Acute vesicular welts, or fluid-filled blisters that are recently made, are likely to react positively to the quick test. 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 genital herpes legions is the herpes pathogen antigen detection test. Cells from a fresh sore are scraped off and then smeared onto a microscope slide. This test unearths markers ( called antigens ) on the surface of cells infected with the herpes pathogen. This test could be done with or in place of a viral culture.
Herpes simplex pathogen ( HSV ) infections may also be diagnosed between outbreaks by the utilization of a blood test.
Blood tests, which detect antibodies to HSV-1 or HSV-2 infection, can be helpful, although the results are not always clear-cut. Herpes virus blood test can find antibodies that are manufactured by the immune system to battle a herpes infection. Antibody tests are sometimes done but aren’t as accurate as a viral culture at finding the root of a particular sore or ulcer. Antibody tests cannot tell the difference between a current active herpes infection and a herpes infection that 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 latest. Some blood tests can notice the difference between HSV-1 and HSV-2.
A Polymerase Chain Reaction ( PCR ) test for genital herpes may 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 liquid,eg spinal fluid. PCR finds the genetic material ( DNA ) of the HSV virus. This test can spot the difference between HSV-1 and HSV-2. The PCR test is not regularly done on skin sores, but it’s best for testing spinal fluid, for those rare cases in which herpes may cause an infection in or around the brain.
In all cases, it is imperative to get enough viral cells for testing, and careful collection methods therefore are vital. All crusts should be softly removed or vesicles gradually 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.