A Level Biology Practice Exam

What is a vector in the context of disease transmission?

1. A type of vaccine

2. A factor that transmits a pathogen

3. A type of cell involved in immunity

4. An antigen that induces a response

The correct answer is: A factor that transmits a pathogen

In the context of disease transmission, a vector refers to an organism that carries and transmits pathogens from one host to another. Vectors are typically living organisms, such as insects or other animals, that can spread diseases without necessarily being affected by the pathogen themselves. For example, mosquitoes are vectors for diseases like malaria and dengue fever, as they can carry the infectious agents while feeding on a host's blood. The focus on the vector's role in transmission highlights the importance of understanding ecological relationships and dynamics in disease spread, which can inform prevention strategies. Being able to identify vectors allows public health officials to target interventions, such as controlling vector populations or protecting susceptible populations from exposure. This understanding is crucial for managing infectious diseases effectively.