Can you imagine 10s of people kissing you hand. What germs does the 10th one get?
Well...just think of the common chalice and the last few who drink the dregs (which one wonders if it is Precious Blood because it is so diluted with 10s of people's saliva).
The Holy Father has concern for the 10s of people who kiss his hand/ring and the contagion it presents to them and yes to His Holiness.
We know that in Europe it is very unusual for anyone to include priest concelebtrants to drink from the common chalice. It just isn't done out of an abundance of caution when it comes to contagion and epidemics (think of the plague!).
At the Vatican, not even the Cardinal concelebrants drink from a common chalice upon the altar, they intinct their Host. The other concelebrants do the same!
Thus we have yet another clarification from the Vatican this morning concerning the Papal Ringgate: