I read a book years ago that I can't remember the name that your comment reminded me of, although achieved a little differently. In the book a global pandemic

I read a book years ago that I can't remember the name that your comment reminded me of, although achieved a little differently. In the book a global pandemic broke out but didn't effect Muslims. How was this possible? A in-world marketing campaign promoted "Mecca Water", in which the antidote / preventative was delivered and the Muslim world was made to believe it was holy / blessed / a pilgrimage experience to consume it. I feel it might have been a product of the post-911 world but I did find it interesting and also fear the future as it seems possible today, I'm sure some are trying.