If my immune system does not work because of the medicine that i take is that there is a possibility of having the chicken box one more time?

If your immune system is compromised, it is possible your body would not be able to send the resources necessary to fight off the infection that you already have immunity to, therefore there is some possibility of a reoccurring illness in an immuno-compromised individual.

Everything they said would be what I would say also:)

Wearing a helmet and elbow pads