Figure 6From: Blood profile holds clues to role of infection in a premonitory state for idiopathic parkinsonism and of gastrointestinal infection in established diseaseRelationship of serum homocysteine to B12 concentration in idiopathic parkinsonism. Two probands with exceptionally high homocysteine (110 and 135 μmol/l) are excluded: the first had a low B12 but normal folate, the second (with frank H. pylori infection and an empyema) a low folate with a normal B12. Neither had received levodopa.Back to article page