The hallmark of chickenpox diagnosis is finding lesions that are blistered, red, and scabbed at the same time. You'd be hard pressed to fake that without significant stage makeup skills.
You are not likely to get chickenpox if you are immune, but it sometimes happens. When it does, the second case is usually mild with few bumps.
You are unlikely to get chickenpox after two vaccines, but it is possible. If it occurs, you would expect a very mild case.
If you get chickenpox after having the vaccine, it is likely to be very mild case and unlikely to cause serious complications.
A case of chickenpox in childhood normally confers lifelong immunity, regardless of the severity of the case. The cellular immunity that prevents chickenpox can decline with time due to age or from immunosuppression from medications or health conditions. But I wonder if you might be asking why a blood test for chickenpox antibodies would be negative if you had chickenpox as a child. There are two possible explanations. One is that the original diagnosis of chickenpox was wrong. The other is that you have a false negative test; this can happen sometimes even when you are still immune. In either case, a vaccine for chickenpox may be a good choice. Talk with your healthcare provider about what makes sense give your medical history.
Shingles is caused by the chickenpox virus. You do not get shingles from someone with shingles; you get chickenpox from someone with shingles. Then when you get older, you will get shingles because you had chickenpox. Or, you might get older and never get chickenpox. In that case, you will thank your mother for having you vaccinated against chickenpox when you were a child.
There is no special medical term for a mild case of chickenpox. Shingles is the term for a recurrence of chickenpox that is usually covering a small area of the body; however, the symptoms may be different and, in some ways, more severe. Shingles isn't considered a milder version of chickenpox.
If you work with elderly and vulnerable people, you should have demonstrated immunity to chickenpox by having it in the past or by having two doses of chickenpox vaccine. If that is the case, there is no risk in visiting your granddaughter.
Yes, you can have a case of chickenpox so mild that you didn't notice any bumps.
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.
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.