A significantly higher response of lymphocytes to PPD was found in persons positive to 1 TU in the skin test than in persons positive to 10 TU. No correlation between the diameter of induration in the skin test and lymphocyte transformation was observed within these groups. 展开 ...
1 His purified protein derivative (PPD) test yielded a positive result with 22 × 28 mm of induration; a chest radiograph was normal. His primary care physician, Dr L, was not convinced that the positive PPD represented a recent conversion to TB, and, after considering with the patient the...
Results The positive rate of PPD test was 12.5 percent among HIV-seropositive people, 28.2 percent among HIV-seronegative. HIV-seropositive rate dereased with CD 4 cell decreasing. Conclusion The positive rate of PPD test was significantly decreased among HIV-seropositive patients. This was ...
induration was considered clinically significant.RESULTS: Of 49 students having PPD tests, 42 returned for reading and 40 of these completed response sheets (81.6% of total). The positive PPD rate was 16.7%. Of 6 students with positive PPD's, 4 were self-assessed correctly. All were =...
Mantoux has to be measured on day 3, and its the induration that is measured, not redness. the induration, might not be seen with naked eyes, however it has to be felt and measured. BCG taken in childhood can cause a false positive mantoux. however, it is unlikely. more likely would ...
An induration of 5 mm is considered positive for the following groups: People with suppressed immune systems HIV-infected people People with changes seen on chest X-ray that are consistent with previous TB Recent contacts of people with TB People who have received organ transplants On the other...
The reaction which characteristically shows a delayed course, reaching its peak more than 24 hours after administration, consists of induration due to cell infiltration and occasionally vesiculation and necrosis. Clinically, a delayed hypersensitivity reaction to tuberculin is a manifestation of previous ...
The average value of reaction induration diameter and vertical diameter were recorded 72 hours later. Results There were 877 positive cases of moderate PPD, including 439 strong positive cases. 51 cases of tuberculosis were confirmed. The moderate-strong positive rate was 10. 24%, and the...
Based on the sensitivity and specificity of the purified pro- tein derivative (PPD) tuberculin skin test and the prevalence of TB in different groups, three cut-points have been recom- mended for defining a positive tuberculin reaction: 5 mm, 10 mm, and 15 mm of induration (see Table 7)...
PPD-stimulated peripheral leukocytes expressing CD4, CD69, cutaneous lymphocyte-associated antigen (CLA) and intracellular IFN-纬 were enumerated in whole blood and compared with the size of in vivo PPD-induced induration and IFN-纬 production levels as measured by ELISA in supernatants of PPD-...