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Hello from JustAnswer.
Have you ever had oral cold sores, even as a child?
When you were diagnosed with HSV2 20 years ago, did you have any blood tests for HSV1?
I had asked for some additional information and have not heard back.
The direct answer to whether someone with HSV2 can get an HSV1 infection is yes. However, it is more complex than a simple answer. A large majority of adults have already been infected with HSV1, usually as an oral infection acquired as a child. So, for the majority of people, they cannot get infected with genital HSV1 infections because of the previous oral HSV1 infections, regardless of whether they have an HSV2 infection. In the minority of people that make it to adulthood without getting HSV1, and then get a genital HSV2 infection, then yes, it is possible for that person to become infected with HSV1, either as a genital or an oral infection.
I asked for the additional information because this may help to clarify your situation. If you had blood tests for HSV1 done at the same time when the diagnosis of HSV2 was made, and that blood test was negative, then that is proof that you have not been infected, so are susceptible to an HSV1 infection. A history of oral cold sores would also indicate that you had a previous HSV1 infection, so would not be susceptible to an HSV1 infection.
If I can provide any additional information, please let me know.