Why Does It Take More Than a Week Before a Mosquito

question 39

Multiple Choice

Why does it take more than a week before a mosquito just infected with yellow fever virus can transmit the disease?

• A)The virus must replicate in the gut of the mosquito before it can reach high enough numbers for transmission to a new human.
• B)Mosquitoes only feed once a week,which limits their ability to transmit the disease rapidly.
• C)Yellow fever is caused by a protozoan.It must develop from the sporozoite form into the mature form to become infectious,and this takes time.
• D)The virus multiplies in the gut of the mosquito,but then needs to migrate to the proboscis (biting nose)of the animal in order to infect a new human being after a new bite.This migration takes time.

---

Definitions:

Sunk Costs

Costs that have already been incurred and cannot be recovered, and therefore, should not be considered in making future economic decisions.

All-Day Ticket

A pass that allows unlimited use or access to a service, such as public transport or an event, for the entire day.

Marginal Benefit

The additional satisfaction or utility gained from consuming or producing one extra unit of a good or service.

Economic Sense

The rationale or logic derived from economic principles or considerations, often related to making decisions based on cost-benefit analyses.