Tab. II.

Chronic diseases that increase the risk of contracting influenza, for which influenza vaccination is strongly recommended (mod. from Ministero della Salute, 2016 [21]).

Chronic diseases	Respiratory and pulmonary diseases (COPD, asthma, cystic fibrosis etc.)	Heart diseases (all congenital or acquired heart conditions)	Diabetes mellitus or any other metabolic diseases (including individuals with BMI > 30)	Chronic renal or adrenal gland failure	Any type of cancer (also during radio- and chemotherapy)	Hematological diseases or hemoglobinopathies	Congenital or acquired immunodeficiency (pharmacological, AIDS etc.)	Chronic inflammatory bowel disease and inadequate intestinal absorption syndrome	Chronic hepatic diseases	Neuromuscular diseases or any disease at risk for aspiration of respiratory secretions