[Robert A Cook PE]

The result is correct, of course, but the actual cause was missed.

Having eaten much more cheese than usual, the resulting gas cloud forced visitors around the average elderly participant in the study to a greater distance from the participant, hence less personal contact (and shorter average visit times), and thus less chance of infection from exposure.......

[AFPhys]

That is how garlic works - and it does a great job!

Protects from vampires, too.

[Palladin]

I think you are on to something.