Keep yourself clean. “Hand washing is the single most important thing that you can do to help prevent the spread of infection and to stay healthy and well,” reports the U.S. Centers for Disease Control and Prevention. As many as 80 percent of infections are said to be passed on by unclean hands. So wash them often throughout the day. Do so especially before eating, preparing food, or dressing or even touching a wound, and do so after touching an animal, using the toilet, or changing a baby’s diaper.

Washing with soap and water is more effective than using alcohol-based hand sanitizers. Children stay healthier when parents train them to wash their hands and to keep them away from their mouth and eyes. Bathing every day and keeping your clothes and bed linens fresh and clean also contribute to better health.

Keep your home clean. Make whatever extra effort is needed to keep your home tidy and clean, inside and out. Eliminate any places where water can collect and mosquitoes can breed. Litter, filth, and uncovered foods and garbage attract insects and vermin, all of which can bring in microbes and cause disease. If there is no toilet, build a simple latrine rather than just relieving yourself in a field. Cover the latrine to keep out flies, which transmit eye infection and other diseases.