Apicella M A, Robinson J A
Infect Immun. 1972 Nov;6(5):773-8. doi: 10.1128/iai.6.5.773-778.1972.
Neisseria meningitidis group X occurs in human carrier populations and is rarely implicated in serious disease. This organism possesses a capsular group antigen which is an acidic polysaccharide. It is composed of the amino sugars, glucosamine, glucosamine-6-phosphate, galactosamine, and the simple hexose, glucose. The group X capsular antigen has an S(20,w) (0) of 3.6, and the acidic nature of the polysaccharide is reflected in an isoelectric point of 3.65. The meningococcal A, B, C, and Y polysaccharide group antigens are also composed primarily of amino sugars. The chemical composition of the group X antigen most closely resembles the capsular antigen of N. meningitidis group Y, which is also predominately a carrier organism.
X群脑膜炎奈瑟菌存在于人类带菌人群中，很少引发严重疾病。这种微生物拥有一种荚膜群抗原，该抗原是一种酸性多糖。它由氨基糖、葡萄糖胺、6-磷酸葡萄糖胺、半乳糖胺和简单的己糖葡萄糖组成。X群荚膜抗原的沉降系数S(20,w) (0)为3.6，多糖的酸性性质反映在其3.65的等电点上。脑膜炎球菌A、B、C和Y群多糖抗原也主要由氨基糖组成。X群抗原的化学组成与Y群脑膜炎奈瑟菌的荚膜抗原最为相似，Y群脑膜炎奈瑟菌也主要是一种带菌微生物。
