![]() Blood tests can find antibodies that are made by the immune system to fight a herpes infection. This test can tell the difference between HSV-1 and HSV-2. PCR finds the genetic material ( DNA) of the HSV virus. A PCR test can be done on cells or fluid from a sore or on blood or on other fluid, such as spinal fluid. The culture often fails to find the virus even when it is present ( false-negative results). If the herpes virus infects the cells, the culture is positive. If no virus infects the cells, the culture is negative. Fluid from a fresh sore is added to certain cells used to grow HSV. To see whether sores are caused by HSV, different types of tests may be done. The test may also be done using other types of samples, such as spinal fluid, blood, urine, or tears. Tests for HSV are most often done only for sores in the genital area. In rare cases, HSV can infect other parts of the body, such as the eyes and the brain. HSV-2 is generally spread by sexual contact. HSV-2 also causes the herpes infection seen in babies who are delivered vaginally in women who have genital herpes. HSV type 2 causes sores in the genital area (genital herpes), such as on or around the vagina or penis.HSV-1 can also cause sores around the genitals. HSV-1 is generally spread by kissing or by sharing eating utensils (such as spoons or forks) when sores are present. HSV type 1 causes cold sores (also called fever blisters) on the lips.The test also can't tell if you can infect another person. The test can't tell if you will get sores or if any sores you have are caused by the herpes virus. That's because a positive result only means you have been exposed to the virus. But in many cases the person will have more outbreaks.Įxperts do not recommend getting a herpes blood test as part of a regular screening for sexually transmitted infections (STIs). A herpes infection may cause only a single outbreak of sores. An HSV infection can cause small, painful sores that look like blisters on the skin or the tissue lining ( mucous membranes) of the throat, nose, mouth, urethra, rectum, and vagina. Herpes tests are done to find out if you have been exposed to the herpes simplex virus (HSV). ![]()
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