Influenza | Flu and Your Immune System

indigoworld.com.au — It remains unclear why outbreaks of the flu occur seasonally rather than uniformly throughout the year. One possible explanation is that, because people are indoors more often during the winter, they are in close contact more often and this is enough to trigger the outbreak. Another is that the cold weakens the immune system... Aug 23, 2007 View in Crawl 4