A positive TST had been looked as follows: >15?mm in children outdated >4 a long time without the risk factors; One particular >10?mm in children younger when compared with 4 years old using risk factors (with out close up experience of the known/suspected the event of TB); and 5�C10?mm in children together with close up contact with any known/suspected the event of TB. 2?and?3 Some other causes o


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