It never fails to amaze me when my husband gets flu how long it take him to get over it, whilst I on the other hand tend to simply work through it. This article might explain why. It suggests that women have more powerful immune systems that men because of their hormones. A study found that the female hormone oestrogen boosts the immune system’s first line of attack against bacteria. It also found that men were more susceptible than women to infection by bacteria, fungi and worms. So perhaps next time my husband thinks he has man flu, he just might be telling the truth.