What is a positive reaction to a TB skin test?

In some people, an induration of 10 mm is a positive reading, notes MedicineNet. This includes IV drug users, recent immigrants to the United States from areas where TB is prevalent, and children under 4 years of age. An induration of 5 mm is a positive reading for recent organ-transplant recipients, individuals recently exposed to TB, and people who are HIV-positive or have weakened immune systems.


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