Colds, Flu and Disease Resistance and Information on Herbs Used to Help Treat Colds, Flu and To Increase Disease Resistance. This is more common in winter.
Some people do seem more prone to repeated viral attack than others.
For the individual, the reasons are often unclear. E qually it is a common experience that following a period of illness, for example flu or glandular fever, one can feel generally run down for a period of several weeks. Again, this phenomenon is poorly explained. Nevertheless in this run-down state other opportunistic infections can sometimes occur. In the elderly for example it is recognised that pneumonia can complicate a bout of flu, because the body's normal defences are in some way less efficient.