Question:medium
Vectors do NOT transmit infection by which of the following routes?
Vectors do NOT transmit infection by which of the following routes?
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Three options are vector feeding or contamination mechanisms; one is how the host swallows a pathogen.
Updated On: Jun 24, 2026
- Ingestion
- Regurgitation
- Rubbing of infected feces
- Contaminated body fluids
Show Solution
The Correct Option is A
Solution and Explanation
Arthropod vectors deliver pathogens through a handful of feeding-related mechanisms, and the task is to find the route that does not belong to vectors. Regurgitation fits, because a vector with a blocked foregut, like the plague flea, vomits infected material into the bite. Rubbing infected feces into the skin fits too, exemplified by the triatomine bug in Chagas disease and the louse in epidemic typhus, where scratching drives the organisms into the wound. Transmission via the vector's contaminated body fluids also fits, as when an infected louse is crushed and its fluids enter abraded skin. Ingestion, however, describes how a person picks up an infection from contaminated food or water; it is a route of human acquisition rather than a mechanism a biting vector employs to pass on disease. Therefore the route not used by vectors is ingestion.\[\boxed{\text{Ingestion}}\]
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