Vacations are good for us. Taking time to rest, relax, and spend time with loved ones can revitalize our bodies as well as our minds. Unfortunately, with travel often comes stress, lack of sleep, changes in daily routines, and unfamiliar and unfriendly microbes found in new environments. These can take a toll on our immune systems and make us more vulnerable to illness and infection. Getting sick can ruin any holiday, so take along these five essentials to reduce your risk.