• Respirology · Sep 1999

    Tuberculin skin testing: determinants and reaction.

    • L Y Lao and T De Guia.
    • Philippine Heart Center, Section of Pulmonary and Critical Care Medicine, Quezon City, Philippines. phcpulmo@epic.net
    • Respirology. 1999 Sep 1; 4 (3): 311-7.

    AbstractMantoux purified protein derivative (PPD) skin testing was performed in schoolchildren who were grouped according to positive (Group I, n = 205) and negative (Group II, n = 79) exposure to recent acid-fast bacilli (AFB) smear-positive tuberculosis (TB) family contact. A prospective case-control study was undertaken to evaluate whether repeat bacille Calmette-Guérin (BCG) vaccination, nutritional state, presence/absence of BCG scar, and degree of AFB positivity of sputum of adult TB cases affect PPD skin reactivity in these two groups. Group I with TB contacts had larger induration (13.00 +/- 11.29 mm) than the Group II control group of 4.52 +/- 6.20; P = 0.000. Purified protein derivative reaction as to the number of BCG vaccination(s) received showed an increase in size as the BCG vaccination is repeated with significantly larger induration in Group I than in Group II (P = 0.048). The nutritional status was subgrouped into A (weight < 10 percentile), B (weight 50-75 percentile), and C (weight > 90 percentile), which were comparable for both groups. The mean PPD induration of subgroup A in Groups I and II was not statistically different. However, the mean PPD induration was highly significant between Groups I and II in subgroup B (12.46 +/- 10.70 vs 3.80 +/- 5.71 mm; P = 0.000) and subgroup C (14.31 +/- 11.54 vs 5.42 +/- 6.70 mm; P = 0.000). Children in group I with the BCG scar were noted to have significantly greater PPD induration size than in group II (14.14 +/- 11.23 vs 5.05 +/- 6.24 mm; P = 0.000). The degree of AFB positivity of sputum of TB adult cases (1+ to 4+ and cavitary TB) has no effect on PPD size (P = 0.766). Close contact with individuals with active TB (AFB smear positive) is a very important factor for PPD skin conversion. Repeat BCG vaccination, malnutrition, and BCG with scars present difficulties in making a diagnosis of TB infection but did not affect PPD reactivity and did highlight the need for thorough clinical evaluation.

      Pubmed     Full text   Copy Citation     Plaintext  

      Add institutional full text...

    Notes

     
    Knowledge, pearl, summary or comment to share?
    300 characters remaining
    help        
    You can also include formatting, links, images and footnotes in your notes
    • Simple formatting can be added to notes, such as *italics*, _underline_ or **bold**.
    • Superscript can be denoted by <sup>text</sup> and subscript <sub>text</sub>.
    • Numbered or bulleted lists can be created using either numbered lines 1. 2. 3., hyphens - or asterisks *.
    • Links can be included with: [my link to pubmed](http://pubmed.com)
    • Images can be included with: ![alt text](https://bestmedicaljournal.com/study_graph.jpg "Image Title Text")
    • For footnotes use [^1](This is a footnote.) inline.
    • Or use an inline reference [^1] to refer to a longer footnote elseweher in the document [^1]: This is a long footnote..

    hide…