Experiments was carried out with mice of CFW infected with 200 T. pseudospiralis. The animals were killed between 7–365 days days post infection and masseter muscles were sectioned in a cryostat and examined using histochemical methods or immunoenzymatic and immunofluorescent methods with monoclonal antibodies. The composition of cells infiltration in the muscle were observed: mast cells, eosinophils, B lymphocytes, plasma cells, CD4⁺ lymphocytes and macrophages. The percentage composition of the cells in inflamatory infiltration in masseter muscles was as follows: eosinophils and CD4⁺ lymphocytes were the most numerous, but the percentage of mast cells, plasma cells, B lymphocytes and macrophages was a little.

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