What is a reason for a false-positive TST result?

Question

Quizplus · Accepted Answer

Reasons for false-positive TST reactions include:
• Lung infection with nontuberculous mycobacteria (NTM). This organism is found in the water and soil and is inhaled.
• Previous bacillus Calmette-Guérin (BCG) vaccine. Many foreign-born patients from countries with high risk of TB may have received BCG abroad. BCG vaccine has been approved by the FDA but is used in very limited situations.
• Incorrect administration or reading of the TST.

What Is a Reason for a False-Positive TST Result