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作为麻风控制方案的一部分,作者于1962～1970年期间对Gudiyatham Taluk(南印度的一个有40万人口的行政单位)的居民做了两次普查并对已确诊的麻风病人进行了随访研究。对有麻风病人的5088户家庭(其中仅有1个病例的单发户占87％)中的22652名接触者进行了临床检查以确定有无麻风,受检率为97.3％。确定了家庭内麻风接触者中所发生的新病例数——继发性发病率(Secondary attack rates),并对与原发病例和接触者有关的特点进行了研究。继发性发病率的定义为
As part of the leprosy control program, the author conducted two censuses of residents of Gudiyatham Taluk (a 400,000-strong administrative unit in South India) between 1962 and 1970 and followed up on confirmed leprosy patients. A total of 22,652 contacts in 5088 households with leprosy, 87% of which were single in only 1 case, underwent a clinical examination to determine the presence or absence of leprosy, with a detection rate of 97.3%. The number of new cases of leprosy contacts in the household that occurred was identified as secondary attack rates and the characteristics associated with the primary cases and contacts were studied. Secondary morbidity is defined as