About 20% of passengers on a flight typically catch a cold (rhinovirus). I researched this issue several years ago because it was quite a problem for me. After

About 20% of passengers on a flight typically catch a cold (rhinovirus). I researched this issue several years ago because it was quite a problem for me. After I began following hygienic measures, I rarely caught a cold. I made a recent comment regarding this (https://news.ycombinator.com/item?id=30539411 https://news.ycombinator.com/item?id=30539411).