Final answer:
The most appropriate nursing intervention to teach a client with a productive cough due to tuberculosis is to use disposable tissues.
Step-by-step explanation:
The most appropriate nursing intervention to teach a client newly diagnosed with tuberculosis and a productive cough is to use disposable tissues. This intervention is important because Tuberculosis (TB) is spread through coughing, sneezing, and spitting. By using disposable tissues, the client can minimize the spread of the bacteria to others.