Grand Rounds

Recent Conversion of Tuberculin Skin Test


Ira Shah
Consultant in Pediatric Infectious Diseases and Pediatric Hepatology, Nanavati Hospital and Incharge Pediatric HIV, TB and Liver Clinics, B J Wadia Hospital for Children, Mumbai, India.

Address for Correspondence: Dr Ira Shah, 1, B Saguna, 271, B St Francis Road, Vile Parle {W}, Mumbai 400056.


Clinical Problem:
A 5 year old girl weighing 14kgs was referred in view of positive Tuberculin skin test {TST} {15mm by 2 TU} in November 2015. She had been tested as she had fever for 3 days but was currently asymptomatic. Chest X ray was normal and there was no contact with a patient having tuberculosis {TB}. Her TST in August 2015 was negative. She was advised Quantiferon TB Gold test that was negative.

What is the cause of her positive TST now_?


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