The air is crisp, the days are shortening, Starbucks is hocking their pumpkin spice creations, and I see people sneezing into their hands everywhere I go. Although we often think of there being only four seasons, many cultures recognise more than just those four. In Bangladesh, there are 6 in total and autumn is broken into shorotkal (early autumn) and hemontokal (late autumn). For public health practitioners, we also acknowledge a special season: Influenza Season.

Public Health measures the calendar year broken into what we call CDC or Morbidity and Mortality Weekly Report (MMWR) weeks. They run Sunday-Saturday and Week 1 begins the first Sunday of each year. Influenza Season (in the Northern Hemisphere) is generally considered to be between Week 40 (around the first week of October) through Week 20 (the end of May).

Unfortunately, just as cold, dry air makes our noses more hospitable to the virus entering our bodies and and poorer weather keeps us indoors, school also begins and large numbers of children spend whole days sneezing on each other and refusing to wash their hands. It’s an annual recipe for disaster.