Cogo R, Ramponi A, Scivoletto, et al. G. Prophylaxis for acute exacerbations of chronic bronchitis using an antibacterial sublingual vaccine obtained through mechanical lysis: a clinical and pharmacoeconomic study. Acta Biomed. 2003;74(2):81-87. Accessed April 25, 2026. https://mattioli1885journals.com/index.php/actabiomedica/article/view/2129