The close quarters of most classrooms make day-care and school environments the perfect places for the spread of infections, especially colds and flu. School-aged children have the highest rates of influenza infection and often pass the illness along to family members, caretakers and classmates. In fact, families with school-age children have more infections than other families, with an average of one-third of the family members infected with the flu virus each year. As you help your children navigate their way through the school year, learn how you can keep them—and yourself—healthy during flu season.