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Interleukins and interferons are called "cytokines" which can be grouped into those secreted by Th1 type cells and those secreted by Th2 type cells. This allows for a quick eradication of a threat and then a return to balance before responding to the next threat. Two mechanisms are at work contributing to the development of chronic diseases.- Pathogen defense mechanisms. When an immature immune cell is exposed to a virus, cancer, yeast, or intracellular bacteria (for example mycoplasma or chlamydia pneumonia), a Th1 response should be initiated. Viruses, especially herpes viruses such as EBV, CMV or HHV6, make proteins that mimic a particular cytokine. By this means the virus deceives the immune system into thinking that the threat is not coming from a virus. The immune system counters with too little of a Th1 response, the virus remains concealed and the infection becomes active or chronic. It is now thought that many, if not most, pathogens have this defensive ability.
- Immune system imbalance. In the above example, the virus has increased its chances of survival by diverting an immune system which is out of balance. It would have been able to respond more accurately if it were healthier. Immune system health is influenced by how we eat and think, our exposure to chemicals and our genetic heritage. In effect we are being judged as individuals for the poor lifestyle decisions we and our parents have made and as a society for not living in greater harmony with nature.
A failure of the Th1 arm of the immune system and an overactive Th2 arm is implicated in a wide variety of chronic illnesses.
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