The clients most at risk of reactivation of latent infections of tuberculosis (TB) are:

• A. Immunocompromised Persons, Substance Abusers, and Those with Diabetes.
• B. Individuals Previously Treated for TB.
• C. Long-Term Cigarette Smokers.
• D. Persons with New-Onset Asthma or Emphysema.

Answer: (A)

Latent TB infection is kept in check by cell-mediated immunity. When that immune defense weakens, latent bacteria can reactivate and cause active tuberculosis. The groups most at risk are those with impaired immune function or conditions that broadly compromise health. Immunocompromised individuals have the strongest risk because their immune systems cannot effectively contain the latent bacilli. Diabetes also increases risk by impairing immune cell function and overall host defenses, making reactivation more likely. Substance use often accompanies malnutrition, poor living conditions, and reduced access to care, all of which can weaken immunity and facilitate progression from latent infection to active TB.

In contrast, someone who has been treated for TB has had therapy aimed at eradicating the infection, so their risk of reactivation is not as high as those with ongoing immune suppression. Long-term cigarette smoking is a risk factor for TB disease in general and can contribute to progression, but it does not carry the same level of risk as established immune compromise. New-onset asthma or emphysema doesn’t directly raise the likelihood of latent TB reactivation.