Inverse association between positive tuberculin tests and positive allergy skin tests in children
Abstract
Background The association between Mycobacterium tuberculosisinfection and atopy remains controversial. Reaction to tuberculosis
infection is mediated by Th-1 immune responses whereas allergic
reactions are mediated by Th- 2 immune response. In patients with
atopic syndrome who also suffer from tuberculosis infection, the
Th-2 response will be suppressed and allergy manifestations will
decrease. Therefore, it is important to determine the appropriate
allergy test and to predict outcome after completing tuberculosis
treatment.
Objective To evaluate the influence of a positive tuberculin test
on skin test results in diagnosing atopic disease.
Methods A cross sectional study was conducted in the pediatric
allergy outpatient clinic, Soetomo Hospital, Surabaya, Indonesia
between 2004 and 2007. Eighty-five patients were enrolled in
this study. The tuberculin test was performed on all patients
with allergy. The allergy test was carried out by performing a skin
scratch test.
Results There was a weak inverse correlation between positive
tuberculin tests and positive allergy skin tests in children (house
dust mite, food and pet allergies). The correlation between a
positive tuberculin test and house dust mite allergy test was
r: -0.364 (P=O.OOl; a=O.Ol). The correlation between the
tuberculin test and food allergies was r: -0.420 (P=O.OOl;
a=O.Ol). The correlation between the tuberculin test and pet
allergies was r: -0.344 (P= 0.001; a=O.Ol).
Conclusions A positive tuberculin test is weakly correlated with
positive allergy skin test results, suggesting that it is appropriate to
do allergy skin testing even in children with a positive tuberculin
test.
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Accepted 2016-09-05
Published 2009-03-01