摘要：A controlled study on the enhancing of tuberculin allergy by one or more earlier tuberculin tests was carried out in a previously untested and unvaccinated population, in an area where the prevalence of non-specific allergy was known to be high. The results have shown that a test with 1 TU of PPD RT 23 in Tween 80 diluent causes subsequent tests to elicit significantly larger reactions. This enhancing effect is more marked among those with initial reactions of 8-13 mm to 1 TU or 10 mm and more to 20 TU. There is practically no enhancement among those whose reactions to 20 TU measure 0-4 mm or even 0-9 mm. Even in the group with reactions of 10 mm and more to 20 TU only some individuals show evidence of enhancement. The enhancing of allergy increases with age. The addition of a 20 TU test increases the enhancement of allergy but mostly among those with reactions of 8-13 mm to 1 TU. The findings suggest that enhancement may be more marked in communities with a high prevalence of non-specific allergy. Full text Full text is available as a scanned copy of the original print version. Get a printable copy (PDF file) of the complete article (1.7M), or click on a page image below to browse page by page. Links to PubMed are also available for Selected References . 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638
