I have a question, since the virus attacks the lungs or the intestine, and doesn't move by blood and keep at site attacking epithelial cells, causing opportunistic infections, and since the most acute symptoms are respiratory, why cant we just use a live vaccine through rectal delivery?

I hear after you get it the body will develop immune response that should protect you for some months, so at least for young people, they can get back to work fast, and be immune, just keep shoving em once a week or so.