Which infection is primarily spread through droplets of saliva?

Influenza is primarily spread through respiratory droplets that are expelled when an infected person coughs, sneezes, or talks. These droplets can then be inhaled by individuals nearby, leading to the transmission of the virus. This mode of transmission makes influenza highly contagious, especially in crowded environments where people are in close proximity.

Other infections mentioned, such as hepatitis, mainly spread through blood and other body fluids rather than through saliva droplets. Tuberculosis, while it can be transmitted through droplets, has specific criteria for transmission and is generally associated with prolonged exposure in closed environments. Bronchitis can be caused by viruses or bacteria and may also involve respiratory droplets, but it is not primarily known for droplet transmission in the same way that influenza is. Understanding these nuances helps in grasping the mechanism of infection transmission effectively.