TB is primarily spread via all of the following, except ___________ .

Tuberculosis (TB) primarily spreads through airborne transmission, which includes activities that release respiratory droplets into the air. Coughing, sneezing, and even speaking can all release these droplets, which can then be inhaled by others, facilitating the spread of the disease.

Touching, on the other hand, is not a primary mode of transmission for TB. The bacteria that cause TB, Mycobacterium tuberculosis, are not typically spread through physical contact or surface contamination. This makes the answer relevant, as it highlights the fact that respiratory transmission is the significant concern regarding the spread of TB, while touching does not contribute to its spread in the same manner. Understanding these modes of transmission is essential for implementing effective infection control measures in settings where TB exposure could occur.