We're all familiar with the WT's "history" of the origin of the phrase "God Bless You" ("Geshundeit" in German) in response to someone's sneezing. The WTS says it originated with the pagan belief that the soul leaves the body when you sneeze and the "bless you" is part of a superstition to protect you from demon invasion. Given that background, JW's don't say anything when someone sneezes. For people brought up to belief it's good manners to "bless" someone for sneezing, this is another of those many socially awkward things about being a Witness.
In the newspaper recently was an article about sneezing, including some related historical facts. According to the report, the term "God Bless You" began to accompany a sneeze in 590 AD when, during an epidemic caused by airborne germs, the Pope offered a blessing to sufferers. Thus was born the custom of blessing someone when he sneezed. It was a good wish, an expression not unlike the bible's "good health to you" found in Acts. The German "Geshundeit" in act means "Bless You." The French use the phrase "Sante" which means health.
Makes you wonder why "the rest of the story" does not appear in any WT publications. Ever wonder about this?