What makes u think they become immune?
I have'nt seen any evidence that suggests having it once means u can't get it a second or third time. If they have it showering would b useless if they coughed or sneezed on u.
Until they perfect a vacine and everyone gets it or a complete disappearance of cases through management i doubt we will b seeing any shops open. Even if some did open by some miracle while the virus was still a problem, would u trust the girls to diligently clean everything down like a nurse in a hospital? I certainly would'nt, most cant even hang the damn shower mat out to dry.