A nurse is working in a community health clinic when a 45-year-old homeless man with a 3-week history of persistent cough, night sweats, weight loss, and hemoptysis arrives. He appears malnourished and reports living in a crowded shelter. What is the most appropriate action for the nurse to take first to ensure workplace safety?

Clinical Safety Guide: Suspected Pulmonary Tuberculosis in the Community Setting

When a patient presents with a cough lasting 3 weeks or longer, night sweats, weight loss, and hemoptysis, especially with risk factors like homelessness or shelter exposure, active pulmonary tuberculosis must be presumed until ruled out. The immediate nursing priority is to protect the clinic environment by initiating airborne infection isolation. This means placing a standard surgical mask on the patient and escorting them directly to a designated negative-pressure isolation room, if available, or a private room with the door closed. No other clinical activity, including history-taking, vital signs, or specimen collection, should occur before this step.

Once the patient is isolated, the nurse should don a fit-tested N95 respirator or powered air-purifying respirator before re-entering the room. All subsequent assessments and interventions are performed under airborne precautions. The patient must be instructed on cough etiquette and must wear a mask during transport for any medically necessary procedures outside the isolation room. Prompt notification of the local public health department and arrangement for sputum acid-fast bacilli smear and culture are essential next steps. The hierarchy of controls mandates that source containment is the most effective strategy to prevent occupational transmission of Mycobacterium tuberculosis.