Isoniazid is prescribed for a 2-year-old child with a positive tuberculin skin test. The mother of the child asks the nurse how long the child will need to take the medication. Which time frame is the...

Isoniazid is prescribed for a 2-year-old child with a positive tuberculin skin test. The mother of the child asks the nurse how long the child will need to take the medication. Which time frame is the appropriate response to the mother?

1. 4 months 2. 9 months 3. 12 months 4. 18 months