I have been diagnoised with Herpes Zosters about a week ago (surrounding the left nipple area  and stretching to the rear side below the shoulders) and visited a dermatologist.  He has advised medication and the sores are getting healed.  What are the reasons for this attack.  Can this spread to other family members, if yes how.  Are there any chances of this recurrence and what precaution should I take.  Is it safe to have sex with my partner. Venkatesh/46/83kgs/was diagnosed with Discitis of the spine

Summarized question: Is Herpes Zosters contagious?