Abstract
The systemic and secretory antibody response in patients with yersiniosis was studied by measuring Yersinia antibodies of various isotypes (IgG, IgA and IgM) and the total concentrations of the corresponding Ig classes in serum and saliva. Specific antibody activities of IgG (IgG antibody concentration divided by IgG concentration) were almost identical in serum and saliva of all patients although the pair of values varied from patient to patient. Almost all salivary IgG of these patients was therefore probably a transudate from the blood. Specific antibody activities of IgA and of IgM, on the other hand, varied independently in serum and saliva. Occasional great differences between serum and saliva values indicate that most of the salivary IgA and IgM (more than 90%) is produced locally at least in some individuals. The local anti-Yersinia response was restricted to IgA in some individuals, to IgM in others, whilst yet other patients produced salivary antibodies of both isotypes.
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