Another article dealing with Mercury:

Metal-specific lymphocytes: risk factors in CFS and other related diseases. 
Vera Stejskal PhD1, Antero Danersund MD2, Anders Lindvall MD2, 
Romuald Hudecek DDS2, Veronica Nordman Bsc1, Amer Yaqob PhD3, 
Wolfgang Mayer Dipl Biol4, Wilfried Bieger MD4, Ulf Lindh PhD3 1Dept of 
Clinical Chemistry, Danderyd Hospital and Karolinska Institute, Stockholm, 
2Dept of Clinical Metal Biology, Univ Hospital,Uppsala, 3Dept of Oncology, 
Radiology and Clinical Immunology, Univ Uppsala,Sweden, 
4Mediziniche-Immunologische Labor, Munich, Germany. Neuroendocrinology 
Letters, 20: 289-298, 1999 
Objective: The objective of this study was to determine the frequency of 
sensitization to dental and environmental metals in patients with chronic 
fatigue - like syndrome (CFS-like syndrome). Methods. An optimized lymphocyte 
stimulation test, MELISA® was performed in 3162 patients with local and 
systemic symptoms attributed to dental restorations. The impact of dental 
metal replacement on health and lymphocyte reactivity was studied in 105 
patients with CFS-like syndrome. Following consultation with the dentist, 
patients underwent replacement of dental metals with metal - free 
alternatives. Health status was followed through inquiries and patients were 
offered retesting by MELISA®. Results. A significant number of patients had 
metal-specific lymphocytes in the blood. Nickel was the most common 
sensitizer, followed by mercury, cadmium, gold and palladium. Out of 86 
patients who underwent dental metal replacement, 78 % reported long - term 
health improval, 20 % unchanged health and remaining 2 % worsening of 
symptoms. Significant reduction in lymphocyte reactivity to dental metals was 
observed in follow-up testing, while reactivity to nickel was only marginally 
affected. Conclusions. Hypersensitivity to dental metals and nickel is 
frequent in patients with CFS-like syndrome. Ongoing metal - induced 
inflammation can be present in the oral cavity and/or in any other place of 
metal deposition. Metal - driven chronic inflammation may affect 
hypothalamic-pituitary-adrenal axis (HPA -axis) and trigger a myriad of non 
specific symptoms characterizing CFS, multiple chemical sensitivity (MCS) and 
other related diseases. The removal of metallic restorations down-regulated 
lymphocyte sensitization and improved patient's health.