Final answer:
Certain diseases are spread by carriers, particularly insects, which act as vectors. Mosquitoes can carry diseases such as Dengue Fever, Yellow Fever, and West Nile virus, making them an example of vector-borne disease carriers.
Step-by-step explanation:
Types of Disease Transmission
Some diseases can be spread through various modes of transmission, one of which involves carriers such as insects. When an insect acts as a carrier, it is considered a vector. A vector is an organism that carries pathogens from one infected individual to another. Diseases like Dengue Fever, Yellow Fever, and West Nile virus are examples of vector-borne diseases, where mosquitoes are the common vectors.
On the other hand, certain diseases are spread through direct contact, waterborne sources, or airborne pathways. Contact transmission includes both direct touch between individuals and indirect touch, such as through contaminated surfaces. Waterborne diseases are caused by drinking or coming into contact with contaminated water. Airborne pathogens, as seen with the flu and cold viruses, spread when an infected individual coughs or sneezes, releasing droplets into the air that are then inhaled by others.