ETH Health and WellnessThe common cold and flu are believed by most physicians to be caused by exposure and susceptibility to a variety of common viruses. However, not everyone catches a cold or flu when exposed, which indicates it’s the strength of the host that dictates whether you come down with an infection. For example, three people could breathe the same germs at the same moment, and one may develop pneumonia, the other some sniffles, and the third person gets away completely unscathed. This suggests that some people can resist viral attacks, while the immune system of others are weakened and run down to a degree that makes them more susceptible to invading pathogens. More