CAT and infection: Patrizia Mecocci (University of Perugia, Italy) [16] measured the activities of a large spectrum of enzymatic antioxidants, such as plasma glutathione peroxidase (GPx), plasma catalase (Cat), plasma and erythrocyte superoxide dismutase (pSOD and eSOD) in subjects enrolled from different European geographical areas, including old subjects, atherosclerotic patients, nonagenarians, patients with infection and patients with cancer.