01777nas a2200313   4500000000100000008004100001260001700042653001500059653001000074653001600084653001000100653002100110653001100131653001100142653001000153653001100163653001200174653000900186100001600195700001400211700001400225700001600239245007600255300001100331490000700342050003200349520106800381022001401449       1984                            d  c1984 Jul-Sep10aAdolescent10aAdult10aAge Factors10aChild10aChild, Preschool10aFemale10aHumans10aIndia10aInfant10aleprosy10aMale1 aJesudasan K1 aBradley D1 aSmith P G1 aChristian M00aIncidence rates of leprosy among household contacts of "primary cases".  a600-140 v56  aInfolep Library - available3 a<p>The data consisted of information from 1,564 "Primary cases" of leprosy of all classification and 9,162 of their household contacts. Household contacts of Indeterminate (Ind), Borderline (BL) and Lepromatous (LL), "Primary case" (PC) had an incidence rate (IR) of 5 per 1000 person years of risk (PYR). Household contacts of Tuberculoid (TT) and borderline tuberculoid (BT) patients had an IR of 3.2 and 3.8 per 1000 PYR respectively. Compared with an incidence rate of leprosy of 1.6 per 1000 PYR among individuals not exposed to leprosy in the same area, household contacts of Non-lepromatous patients had a relative risk of twice as high and contacts of lepromatous and borderline lepromatous patients a relative risk of 3 times as high. The incidence rate was higher among household contacts of bacteriologically positive patients, among contacts closely related and in households with multiple cases. The peak age specific incidence rate among household contacts was between the ages 5-9 years of age. The significance of these findings are discussed.</p>  a0254-9395