...back on topic for a moment:
the docs claim that 'ADT' - leuprolide acetate chemotherapy (Firmagon, Lupron, Eligard etc) - has no effect on your immune system, however many of us (self included) here have found that as soon as we get that leuprolide injection, our shingles (normally kept in check by the immune system) reawakens with a vengeance.
I got back on that train last Nov 5 and within a week the shingles was back, has not quit either. Xtandi has made it worse. This despite having had both Zostavax and Shingrex.
Gratefully, my lifestyle does not involve crowds, air travel or cruises. The trails are usually not very crowded. When they get that way, I go to other trails.
EDIT: off topic again: I too have a flip phone, but the wife just brought me home an Apple 8 smart phone, so I guess I will be using that now.