In the United States, flu season typically begins in October and extends through early Spring. But while the season normally peaks during the winter months, the influenza virus isn’t confined to any specific range of dates or to any particular kind of victim (although children under the age of 18 years are more widely affected according to statistics). Nevertheless, the start of a new school year, along with decreasing temperatures, frequently serve as harbingers of contagious disease. Perhaps it’s because when we are crowded into classrooms we are exposed to more germs. Or maybe it’s because our immune systems are…