No it isn't impossible. But not actualy possible eather. The chickenpox can lie dormant after treatment for months even years. Which could lead to the misconception that someone had it twice.
Every disease or illness u have ever had you can't have again. Your body knows how to fight it. If you've had it two or more times it is a different infection
Not really. Even tho your body does know how to fight against a certain disease. You can never be totaly immune to any illness. Just look at the common cold !!
The world hates me