This poll is only for ME/CFS patients whose illness appeared immediately after vaccination. The poll asks whether post-vaccination ME/CFS patients have any chronic active herpesvirus or enterovirus infections, as viral infection-triggered ME/CFS patients often have. The purpose of this poll is to see whether vaccine-triggered ME/CFS might involve the same chronic active viral infections that are found in ME/CFS triggered by viral infection. To ensure this poll only includes patients whose ME/CFS was clearly triggered by vaccination, in this poll we are looking for patients whose ME/CFS symptoms suddenly appeared within say one week of a vaccination (as opposed to patients whose symptoms appeared months after a vaccination, when it is less certain that the vaccine triggered the ME/CFS). So if your ME/CFS suddenly appeared within a week of a vaccination (but not if it appeared months after vaccination), please vote in this poll, and indicate which chronic active infections you have. Please also post some details about your vaccine trigger (which vaccine it was, and how long it took for the ME/CFS symptoms to appear). To be diagnosed with a chronic active infection, the following criteria should be satisfied (you need to have certain elevated antibody titers to be diagnosed with a chronic active infection; if your titers are lower than the titer thresholds give below, please vote for an inactive infection): Epstein-Barr virus: Elevated antibodies in the EBV IgM VCA test and/or the EBV EA diffuse test by ELISA indicate active EBV infection, says Dr Lerner. Alternatively, antibody titers of 1:640 or higher in the Quest EBV IgG VCA test and titers 1:160 or higher in the Quest EBV IgG EA test indicate active EBV infection, says Dr Montoya. HHV-6: Antibody titers of 1:160 or higher in the LabCorp HHV-6 IgM test and the LabCorp HHV-6 IgG test indicate active HHV-6 infection, says Dr Lerner. Alternatively, antibody titers of 1:320 or higher in the Quest HHV-6 IgG IFA test indicate active HHV-6 infection, says Dr Montoya. Cytomegalovirus: Elevated IgG antibody titers for cytomegalovirus indicate an active chronic CMV infection, says Dr Lerner. He says you must test for IgG, not IgM, as the IgM titer is insensitive. Coxsackievirus B and echovirus: Antibody titers of 1:320 and higher in the ARUP Lab coxsackievirus B and echovirus antibody neutralization blood tests indicate a chronic active infection with these enteroviruses, says Dr Chia. Note that for these viruses, only the ARUP Lab antibody neutralization tests, or a similar antibody test using the neutralization method, are valid. Other methods of antibody testing (such ELISA, IFA or CFT) are not sufficiently sensitive and are not valid tests for ME/CFS purposes. If any of your six coxsackievirus B serotypes have titers of 1:320 and higher in the ARUP Lab tests, please vote for an active infection for coxsackievirus B. Likewise for echovirus. If they were all lower than 1:320, please vote for an inactive infection. If you were tested for coxsackievirus B or echovirus by any lab other than ARUP, Cambridge Biomedical, then please vote for "I have not been tested for this virus". It is only the neutralization test offered by these labs that is valid for testing in ME/CFS. Alternatively, a positive result in a stomach biopsy test, when the biopsy tissues are sent for testing to Dr Chia's lab, indicates a chronic active enterovirus infection.