What is the primary role of a disease vector?

What is the primary role of a disease vector?

• A. To transmit pathogens
• B. To carry and transmit pathogens from one host to another
• C. To disinfect water
• D. To form antibodies

Answer: (B)

Vectors carry pathogens from one host to another, serving as the bridge that lets a disease move between organisms. They’re not the pathogens themselves, but they provide a route for infection by acquiring a pathogen from an infected host and then delivering it to a new one, often through a bite or contact. Some vectors host the pathogen as it develops or multiplies inside them before transmission. This is why certain insects and arachnids—like mosquitoes, ticks, and sandflies—play such a crucial role in spreading diseases such as malaria, dengue, Lyme disease, and leishmaniasis. Disinfecting water and antibody production are unrelated to a vector’s role, since disinfection is a public health action and antibodies come from the immune system. The best description of a disease vector’s primary role is to carry and transmit pathogens from one host to another.

Vectors carry pathogens from one host to another, serving as the bridge that lets a disease move between organisms. They’re not the pathogens themselves, but they provide a route for infection by acquiring a pathogen from an infected host and then delivering it to a new one, often through a bite or contact. Some vectors host the pathogen as it develops or multiplies inside them before transmission. This is why certain insects and arachnids—like mosquitoes, ticks, and sandflies—play such a crucial role in spreading diseases such as malaria, dengue, Lyme disease, and leishmaniasis. Disinfecting water and antibody production are unrelated to a vector’s role, since disinfection is a public health action and antibodies come from the immune system. The best description of a disease vector’s primary role is to carry and transmit pathogens from one host to another.