Why is it harder to determine exposure to airborne transmitted diseases than exposure to bloodborne transmitted diseases?

Determining exposure to airborne transmitted diseases is more challenging because these pathogens can spread through the air over distances and remain viable in the environment for extended periods, making it difficult to trace specific sources of exposure. In contrast, bloodborne diseases typically require direct contact with infected bodily fluids, allowing for more straightforward identification of exposure events. Additionally, airborne diseases often involve complex factors like ventilation, population density, and individual susceptibility, further complicating exposure assessment.