Final answer:
In a community screening program for tuberculosis, the nurse would focus on screening persons who abuse alcohol as they are at increased risk due to potentially weaker immune systems and behaviors leading to crowded living conditions.
Step-by-step explanation:
In a community screening program to identify potential cases of tuberculosis (TB), a community health nurse would focus the screening on persons who abuse alcohol. This is because individuals in this group may have weaker immune systems, making them more susceptible to infections like TB. Additionally, behaviors associated with alcohol abuse, such as residing in crowded conditions, can increase the risk of transmitting TB. Other at-risk populations generally include those with HIV/AIDS, people from areas where TB is prevalent, healthcare workers who serve patients with TB, and individuals who live or work in facilities like prisons and homeless shelters where TB can spread more easily.