Contact Dermatitis 1999 May;40(5):269-72 Chronic fatigue syndrome and nickel allergy. Marcusson JA, Lindh G, Evengard B Department of Dermatology, Huddinge University Hospital, Sweden. [Medline record in process] 50 patients with chronic fatigue syndrome (CFS) and 73 controls were patch tested with 8 metal allergens. We found an overrepresentation of allergies among the CFS patients, which was not significant. However, allergy to nickel occurred in 36% of patients in the CFS group and in 19% of subjects in the control group (p<0.05). The high frequency of nickel allergy was more noteworthy in females in the CFS group than among female controls (52% and 24%, respectively, p<0.05). Similarly, in the males the figures were 14% and 9%. We suggest that in vivo immunoactivation by ions of nickel, or metal cross-reacting with nickel, could be an etiological factor in CFS. PMID: 10344482, UI: 99274279 ----------