What is a characteristic of airborne transmission?

Airborne transmission is characterized by the ability of infectious agents to remain suspended in the air for extended periods and travel over distances greater than a few feet. This means that tiny droplets or particles containing the pathogens can be inhaled by individuals who are not in direct proximity to the infected person.

The correct answer highlights this key aspect of airborne transmission, emphasizing the persistence of residue in the air, which plays a vital role in the spread of certain diseases, including infections like tuberculosis and measles. This mode of transmission is particularly concerning in enclosed spaces, where ventilation may not adequately dilute or remove infectious particles.

The other options focus on aspects of transmission that do not align with airborne characteristics. For example, indicating that it only affects individuals with weakened immune systems overlooks the fact that anyone can contract an airborne disease, not just those with compromised immunity. Mentioning direct contact with an infected person pertains more to direct or droplet transmission, while the idea of contamination through surfaces aligns more closely with fomite transmission rather than airborne methods. Understanding these distinctions is crucial in preventing the spread of infections effectively.