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B. MAYTHAR, Z. ZAKAY-RONES; Local and Humoral Chlamydial Antibodies in Trachoma Patients of Different age Groups. Invest. Ophthalmol. Vis. Sci. 1972;11(8):651-654.
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The frequency and level of fluorescent chlamydial antibodies in sera and lacrimal fluids of trachomatous patients were compared according to age. While no differences were observed in the frequency of humoral antibodies among the various age groups, the average antibody titer increased in the adult group above 61 years up to 1:60 compared to 1:30 to 1:40 in all the other groups. On the other hand, there was a decrease in both the frequency and level of the secretory antibodies in correlation with aging. In patients up to the age of 40 the average titer was 1:25, then it fell to 1:16 and further decreasedto an average titer as low as 1:8 in patients above age 61. The percentage of negative samples which was in this study about ten to 15 per cent up to age 61 rose to 38 per cent in the group of people above this age.
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