If you are not immune to chickenpox from previous infection or immunization, you may be at risk for chickenpox from exposure now. If you are immune, there is no risk.
Chickenpox is much less prevalent in the US than it was before vaccination was approved. Since chickenpox vaccine was approved in 1995, chickenpox cases have decreased 90% from their previous level of about 4 million cases per year.
If you have already had exposure to chicken pox you will not get chickenpox again. However, you can still get shingles from exposure because it is a reaction of the previous infection.
Natural immunity to chickenpox results from previous infection. There is no other way to be naturally immune to chickenpox. Sometimes, the previous infection may be mild enough that the disease was not noticed. You can become artificially immune to chickenpox by getting chickenpox vaccine.
Some people have such a mild case of chickenpox that they don't notice being ill. This could result from maternal antibodies (from birth or breastfeeding), previous vaccination, or other unknown factors.
It is not normal to have a test to detect the level of chickenpox virus in your blood. There is a high level of chickenpox virus in your blood early in the infection. I suspect that you're asking about chickenpox antibody levels in your blood. High levels of antibodies to varicella zoster virus indicates immunity, whether through previous infection or through vaccination.
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There is no chickenpox RNA; chickenpox is a DNA virus.
A person with a history of chickenpox or history of chickenpox vaccine will typically have a positive antibody test for chickenpox.
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Chickenpox vaccine is useful. It reduces the risk of chickenpox, of complications, hospitalizations, and deaths from chickenpox, and of shingles.
Chickenpox is not an autoimmune disease. Chickenpox is a viral communicable disease.