- patients participating in another research protocol. - patients receiving oral or intravenous glucocorticoids - immunosuppressed patients (including hiv infection) - glaucoma patients. - patients with allergy to dexamethasone. - pregnant or lactating women - concomitant autoimmune diseases - refusal by the patient or family to participate in the study

- patients participating in another research protocol. - patients receiving oral or intravenous glucocorticoids - immunosuppressed patients (including hiv infection) - glaucoma patients. - patients with allergy to dexamethasone. - pregnant or lactating women - concomitant autoimmune diseases - refusal by the patient or family to participate in the study