A nurse is assisting with the admission of a client who has tuberculosis with a productive cough. Which type of isolation precautions should the nurse initiate for the client?

Choice A rationale Droplet precautions are utilized for pathogens transmitted by large respiratory droplets that travel short distances, typically less than 3 to 6 feet, such as influenza or pertussis. Mycobacterium tuberculosis is much smaller and remains suspended in the air for extended periods. Therefore, standard surgical masks used in droplet precautions are insufficient to filter out the microscopic nuclei that carry the tuberculosis bacteria into the lungs. Choice B rationale Airborne precautions are mandatory for tuberculosis because the bacteria are carried in tiny droplet nuclei smaller than 5 microns. These particles stay buoyant in the air and can be inhaled deep into the alveoli. This protocol requires a private, negative-pressure room with at least 6 to 12 air exchanges per hour and the use of an N95 respirator to filter out the infectious particles. Choice C rationale Protective environment precautions, also known as reverse isolation, are designed to protect immunocompromised clients, such as those undergoing bone marrow transplants, from environmental pathogens. This involves positive-pressure airflow to keep external contaminants out of the room. This is the opposite of what is required for a client with an active tuberculosis infection, where the goal is to contain the bacteria within the room. Choice D rationale Contact precautions are implemented for infections spread by direct physical contact or contact with contaminated surfaces, such as MRSA or Clostridioides difficile. While environmental hygiene is important, tuberculosis is not primarily transmitted through skin-to-skin contact or fomites. Using only contact precautions would leave healthcare workers and other clients completely unprotected against the inhalation of the airborne bacteria produced during the client's productive cough.