Influenza vaccine

Influenza vaccines, also known as flu shots, are vaccines that protect against influenza. A new version of the vaccine is developed twice a year as the influenza virus rapidly changes. While their effectiveness varies from year to year, most provide modest to high protection against influenza.

Guidance for ME/CFS and Fibromyalgia patients
Doctors are divided on whether patients with ME/CFS or fibromyalgia should have a flu shot. The general guidance is relying on your past experience with the influenza vaccine and your known allergies. "There is some evidence that the immune systems of people with FM and ME/CFS are already in a state of chronic activation.  In that case, any kind of immunization could push this hyper-stimulated state into overdrive, which could significantly increase your symptoms." "If you decide you would like to be vaccinated, then I recommend starting with an injection of one third the usual adult dose. If there are no side effects, then the same dose can be repeated in a month's time, and the same again after one further month. The reason for this is that Physicians specializing in ME/CFS, including myself, have reported cases of flu symptoms in some patients with ME/CFS for 4 or more weeks after the full dose of flu vaccine has been given. It is unknown whether patients with Fibromyalgia or Environmental Sensitivities and/or Intolerances are more prone to such a response. However overlap of these conditions with ME/CFS has been repeatedly reported in the medical literature, and so caution is probably wise. Having symptoms for this length of time is not normal after a flu shot. It is called an adverse vaccine event and needs to be reported to the Department of Health. There is an Adverse Vaccine Event Form that must be filled out by the doctor. Each region has its own Department of Public Health." "There are anecdotal reports of people with ME/CFS suffering a relapse, or even developing ME/CFS, after a flu vaccination.""This could be due to the fact that research into immune system dysfunction in ME/CFS has found evidence of what is called immune system activation – which equates to a persisting and overactive immune response to a triggering infection.""Vaccines are designed to mimic the infection they are designed to protect against and so they also trigger an immune system response.""In a small survey carried out by the ME Association among its members a few years ago, seven out of 21 people had no problems at all, 13 reported an exacerbation of symptoms ranging from mild (3) or moderate (7) through to a severe relapse in three cases. Interestingly, there was one report of a teenager who noticed a slight improvement in symptoms following vaccination.""An ME Association online poll carried out in November 2008 asked how the flu vaccine had affected M.E. symptoms. There were 191 responses:""86 (45%) reported no change""52 (27%) said they were much worse""42 (22%) said they were slightly worse""7 (4%) said they were slightly better and,""4 (2%) said they were much better after the jab.""Some doctors believe that this may be more likely to occur if you still have on-going flu-like/infection symptoms such as enlarged glands, sore throats, problems with temperature control, etc."
 * 2011, Flu Shots: Should You Get One if You Have Fibromyalgia?
 * 2014, FLU Vaccination and Chronic Fatigue Syndrome
 * 2017, The Flu and M.E. – all you need to know about the 2017/18 flu vaccine

Learn more

 * Wikipedia