众所周知,人乳喂养婴儿之发病率与死亡率均比牛乳喂养者低。除了已证实这可能与人乳中存在许多抗菌因子,如免疫球蛋白、补体和溶菌酶等有关外,也表明与人乳中含有的大量白细胞,尤其是中性多核细胞与巨噬细胞所起的保护作用有关;但关于这些细胞的杀菌能力则所知甚少。 It is well-known that the morbidity and mortality of breast-fed infants are lower than that of milk-fed infants. In addition to the fact that this may have been linked to the presence of many antimicrobial factors in human milk such as immunoglobulins, complement and lysozyme, it has also been shown to be associated with the abundance of leukocytes in human milk, especially neutral multinucleated cells and macrophages Of the protective effect; but little is known about the bactericidal capacity of these cells.