I can't remember ever having the flu (been ill since childhood), so it seems I've enjoyed some sort of immunity to this kind of infection, despite my fair share of colds and recurrent streps. Then a couple months back I contracted a bug which had me nauseous and vomiting for a day. Interestingly this was followed by a 24 hour, 90% reprieve from ME/CFS symptoms. This has, for me, concretized the idea that my energy problems are caused by an immune response or unhealthy cytokine profile. Is this a shift from TH2 to TH1, or the other way around? Is it an appropriate response that's not able to eradicate infection? I don't know. Does anyone know the typical immune response to a flu with regards to TH1 and TH2 balance?
I assume your ME got better as you'd been pulled into TH1 as the common cold and flu virus both put body into TH1. From the TH1 state our body can fight things it cant from the TH2 state.
When the resting cell is exposed to a virus, cancer, yeast, or intracellular bacteria (like mycoplasma or chlamydia pneumonia), the Th1 response is initiated.
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Certain viruses thou have their own protective mechanism to try to stop the body from doing that eg herpes viruses eg CMV, EBV, HHV6 can trick the body so instead make it go into TH2 (from which the body then cant fight them well).
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For more info see the quotes from Cheney at
http://www.anapsid.org/cnd/diagnosis/cheneyis.html below
"CFIDS patients are Th2 activated. This means they over-respond to toxins, allergens, normal bacteria and parasites, and under-respond to viruses, yeast, cancer and intracellular bacteria."
"Dr. Cheney explained that the immune system has two different modes of attack, based on the type of invader. One is Th1 (T Helper 1). It goes after organisms that get inside our cells intracellular pathogens. It is also known as cell-mediated immunity.
The other is Th2 (T Helper 2). It attacks extracellular pathogens organisms that are found outside the cells in blood and other body fluids. Some call this humoral or antibody-mediated immunity.
A healthy immune system is dynamic, able to switch back and forth as needed, quickly eradicating one threat and then resting before responding to the next. "
"Th0 are the naive, or unformed, cells of the immune system. They are resting, just waiting for an invader. When infection occurs, they convert to either Th1 or Th2, depending on the type of threat. When the resting cell is exposed to a virus, cancer, yeast, or intracellular bacteria (like mycoplasma or chlamydia pneumonia), the Th1 response is initiated. "
"How does the naive cell know which pathway to take? It depends on the cytokine information received. The presence of any organism from the left side triggers production of a cytokine called Interleukin 12. IL-12 causes the Th0 cell to move down the Th1 path. On the other hand, organisms on the right side trigger the production of Interleukin 10 (IL-10), which causes the Th0 cell to move down the Th2 path.
Viruses, especially herpes viruses like EBV, CMV and HHV6, make proteins that mimic IL-10. The virus deceives the immune system into thinking that the threat is coming from the opposite side! So the immune system shifts from the Th1 mode that attacks viruses to the Th2 mode that does not. The virus increases its chances of survival by diverting the immune system."