流行病学研究显示,黑人较其他种族更易发生局限型青少年牙周炎(LJP),虽然LJP发生率并不高,但它具有明显的家族倾向,这表明对LJP的敏感性是可能遗传的。对以黑人为主的LJP患者的免疫学研究表明,绝大多数患者对放线共生放线杆菌产生强的IgG Epidemiological studies have shown that blacks are more susceptible to localized juvenile periodontitis (LJP) than other races, and although the incidence of LJP is not high, it has a pronounced familial propensity that suggests that susceptibility to LJP is likely to be inherited. Immunologic studies of predominantly black LJP patients show that the vast majority of patients develop strong IgG against actinomycetemcomitans