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The salivary and serum concentrations of immunoglobulins G, M and A (IgG, IgM and IgA), and the salivary concentrations of albumin were measured by ELISA in 30 cats with chronic gingivostomatitis and 32 healthy cats. The cats with chronic gingivostomatitis had significantly higher salivary concentrations of IgG, IgM and albumin, and higher serum concentrations of IgG, IgM and IgA, but significantly lower salivary concentrations of IgA than the healthy cats. The cats with chronic gingivostomatitis were treated with either methylprednisolone, sodium aurothiomalate, metronidazole and spiramycin, or oral hygiene products. After three months of treatment, the cats receiving methylprednisolone had a significant reduction in serum IgG levels compared to the cats treated with sodium aurothiomalate or metronidazole and spiramycin, but after six months of treatment there were no significant differences between the groups. Before the treatments, the levels of oral inflammation were not correlated significantly with any of the serum or salivary immunoglobulin levels. However, the changes in oral inflammation were correlated significantly with the changes in the salivary IgM concentration after three and six months of treatment, and with the change in the salivary IgA concentration after six months of treatment.
Harley et al. (Sat,) studied this question.