Final answer:
Strep throat is caused by contact with infected mucus, while tuberculosis is spread through the air. Tuberculosis is a serious lung disease and both conditions are preventable through public health measures and awareness.
Step-by-step explanation:
Strep throat and tuberculosis are caused by contact with infected mucus and air, respectively. Strep throat is typically caused by the bacteria known as Streptococcus pneumoniae, and it is spread through the saliva or respiratory droplets of an infected person. Tuberculosis (TB), on the other hand, is caused by the Mycobacterium tuberculosis bacterium, and it is highly contagious as it can be spread through the air when an infected individual coughs, sneezes, or spits. Therefore, the correct answer to the question is both A) Mucus and D) Air, considering the pathogens involved.
Moreover, tuberculosis is a serious lung disease and one of the most common diseases worldwide caused by bacteria. Strep throat is another common bacterial disease, often presenting with symptoms such as a sore throat and fever. Public health measures, such as those depicted in early 20th-century notices, are important to remind individuals of the routes of transmission and to encourage behaviors that reduce the spread of these infections.