Could a mouthwash replace a tube down your throat to diagnose pneumonia?

This study tests whether a simple salt-water mouth rinse can detect pneumocystis, a lung infection that can be life-threatening in people with weak immune systems. Current diagnosis requires coughing up sputum or a tube inserted into the lungs, which can be uncomfortable. Researchers will compare the oral rinse method with standard tests in over 1,000 participants, including patients with HIV, cancer, or organ transplants, as well as healthy volunteers.