PR problems can't exist when ignorant or uniformed people think...

PR problems can't exist when ignorant or uniformed people think something has failed to work? Ok if you say so. I would think that good PR reduces or removes the potential for customers to make uninformed or ignorant decisions.

Again, as I said earlier, the public perception is more important than the reality. Hopefully there isn't an outbreak.

It's a double edged sword. ZNO were quite happy to imply in the announcement that it was the use of their product in a previous competition that resulted in no NZ athletes contracting Norovirus (which can also be passed through airborne particles).