Final answer:
Measles is primarily transmitted through airborne transmission when infected individuals expel droplets by coughing or sneezing, which are then inhaled by others.
Step-by-step explanation:
Measles, identified as a respiratory tract infection, is transmitted primarily through airborne transmission. This occurs when an infected person coughs or sneezes, releasing droplets into the air. These droplets contain the measles virus and can be inhaled by people nearby, leading to the spread of the infection. Measles can also be spread by direct contact with infectious secretions. However, the most significant mode of transmission is through the inhalation of airborne droplets containing the virus. It is important to note that the measles virus is highly contagious, and the infection can lead to serious symptoms such as a high fever, conjunctivitis, sore throat, and a characteristic rash that starts on the face and spreads to the extremities.