The protozoan Plasmodium vivax is one of the Plasmodium species capable of causing malaria in humans, and is transmitted by the Anopheles mosquito. The protozoan undergoes one of its developmental stages inside the Anopheles mosquito. With regard to vector-borne transmission, this is an example of:

Question

BlackTom AI · Accepted Answer

Beginning with a broad look, this question asks us to classify the type of vector-borne transmission demonstrated when a parasite develops inside its arthropod vector before infecting a human host.
Option a: Indirect contact transmission. This category typically involves transfer through an intermediate object or surface (fomites) or via the environment, not via an organism that supports a developmental stage of the pathogen. Since Plasmodium vivax relies on biological development inside the mosquito, this option mislabels the mechanism.
Option b: Direct contact transmission. Direct contact implies immediate physical transfer between hosts (like touching, kissing, or sexual contact) without an arthropod or intermediate host. Malaria transmission does not occur through direct person-to-person contact, so this option is incorrect.
Option c: Mechanical transmission. Mechanical transmission occurs when a vector carries an infectious agent on its body parts without supporting any developmental cycle inside the vector (e.g., certain flies transferring pathogens passively). In malaria, the parasite undergoes development within the mosquito’s tissues, which is not merely passive carriage, so this option does not fit.
Option d: Biological transmission. This term refers to pathogens that require development or multiplication within the vector, with the vector acting as an essential host in the pathogen’s life cycle. Plasmodium vivax undergoes development inside the Anopheles mosquito, illustrating true biological transmission.
In summary, each incorrect option fails to capture the essential feature here—the parasite’s developmental progression inside the mosquito—whereas biological transmission accurately describes this scenario.

类似问题

Question at position 18 Establishing a wholly-owned subsidiary provides the quickest access to a new market.TrueFalse

Question at position 17 Leading companies should recognize that a firm based in a country with a national competitive advantage is not guaranteed ............................ as it implements its chosen international business-level strategy.dominanceplansuccessNone of the Above

Question at position 16 Costs associated with the issues firms face when entering foreign markets, including unfamiliar operating environments, economic, administrative, and cultural differences, are known as regionalization costs.TrueFalse

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单