At this weekend’s Masses I made a point of paying attention to just how much contact goes on at Communion time.
Not once did my fingers contact any part of anyone’s mouth when distributing on the tongue.
About 2 out of every 3 people who received in the hand had some kind of contact with my fingers.
I made it a point to avoid contact using either method, so I am admitting up-front that I was more particular about this than usual.
Interrestingly, the I found that the least likely method for coming into contact with the communicant was when they received on the tongue and kneeling. Afterwards, I thought about this and realized the reason. When people are standing, they are “in motion” the transition from standing to walking is so natural that many people hardly even come to a full stop when receiving Communion–especially those receiving in the hand. If there were a red sign at the altar rails, I would have written a lot of tickets for a “California stop.”

On the other hand, when people are kneeling, there is some effort involved in transitioning from kneeling to walking. People who receive kneeling are more likely to “be still” when they do so.
What I noticed is that whatever method is used, the real “culprit” for contact between the fingers and the communicant is motion. Most of the contact with communicants hands had little to do with the method of placing the host, and much more to do with how quickly the communicant moved his hands–either the motion of the hands themselves, or the movement of the whole body.
And just for the record, I was
not once licked, bitten, or slobbered upon.