Adults exposed to a child with chickenpox in the home are less likely to develop shingles.
The vaccination still offers the best protection even if it doesn't provide long-standing immunity.
Re-exposure to the herpes virus as an adult, after having chickenpox as a child, boosts immunity.
According to UPI, immunity is boosted with repeated exposure but it does not provide complete protection.
Infection with the varicella-zoster virus causes chickenpox.