Final answer:
Children under 4 years old with an induration of 10mm or more in a tuberculin skin test are considered positive for tuberculosis infection.
Step-by-step explanation:
Children under 4 years old with an induration of 10mm or more in a tuberculin skin test are considered positive for tuberculosis infection
. The tuberculin skin test is a way to determine if a person has been exposed to the bacteria that causes tuberculosis. A positive test indicates that the immune system has responded to the bacteria, suggesting an infection. Further testing, such as a chest X-ray, may be needed to confirm the diagnosis.