According to the CDC, "La Crosse Encephalitis virus (LACV) is passed from the female mosquito to the eggs she lays. The virus can survive in dormant eggs through the winter and develop into infected, flying mosquitoes in the spring. " What is the most accurate term to describe the transmission of LACV within the mosquito ?

Question

According to the CDC, "La Crosse Encephalitis virus (LACV) is passed from the female mosquito to the eggs she lays. The virus can survive in dormant eggs through the winter and develop into infected, flying mosquitoes in the spring. "  What is the most accurate term to describe the transmission of LACV within the mosquito ?

BlackTom AI · Accepted Answer

Question: According to the CDC, the La Crosse Encephalitis virus (LACV) is passed from the female mosquito to the eggs she lays, and the virus can survive in dormant eggs through the winter and develop into infected, flying mosquitoes in the spring. What is the most accurate term to describe the transmission of LACV within the mosquito?

Option 1: Horizontal transmission. This refers to transmission between individual organisms, typically from one organism to another, such as a virus spreading from a mosquito to a human via a bite. It does not describe transfer from parent to offspring within the mosquito population itself, so it is not the best match for the described egg-to-offspring passage.

Option 2: Tangential transmission. In vector biology, tangential transmission usually refers to incidental or incidental contact-based transfer that is not a normal life-cycle route for the pathogen. It does not capture the parent-to-offspring propagation occurring via the eggs, so this choice is misleading.

Option 3: Mechanical transmission. This describes a situation where a pathogen is passively carried by an organism (often via contaminated surfaces or body parts) without the organism being biologically infected or supporting the pathogen’s life cycle. Since LACV is maintained and developed through the mosquito’s reproductive cycle, mechanical transmission does not accurately describe the process here.

Option 4: Vertical transmission. This term denotes transmission from parent to offspring, across generations. In the scenario described, the virus survives in the mosquito’s dormant eggs and then appears in the next generation of mosquitoes, which fits the definition of vertical (transovarial) transmission within the vector population.

Summary reasoning: The key concept is that the virus is inherited by the offspring through the eggs, enabling overwintering and emergence in spring. Among the listed options, vertical transmission uniquely captures parent-to-offspring propagation, whereas horizontal, tangential, and mechanical transmissions describe other routes that do not involve transmission from mother mosquito to her progeny within the vector’s life cycle.

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