JE virus life cycle in nature run between ?
**Core Concept**
The JE virus life cycle in nature involves a complex interaction between the virus and its natural reservoir, which is primarily the _Culex_ mosquito species. This cycle is characterized by a specific vector-host relationship, where the virus is transmitted between the mosquito and the host through a process of replication and amplification.
**Why the Correct Answer is Right**
The correct answer is **C. Culex mosquito and vertebrate hosts**. The JE virus life cycle in nature runs between the _Culex_ mosquito species and vertebrate hosts, such as rodents, pigs, and humans. When an infected mosquito feeds on a vertebrate host, it injects the virus into the host's bloodstream, where it replicates and multiplies. The infected host then serves as a source of virus for other mosquitoes that feed on it, perpetuating the cycle of transmission. This process is facilitated by the presence of specific receptors on the surface of mosquito cells and vertebrate cells, which allow the virus to bind and enter the cells.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the vector-host relationship that is essential for the JE virus life cycle in nature. While the virus can be transmitted through other routes, such as vertical transmission from mother to offspring, the primary life cycle involves the _Culex_ mosquito species and vertebrate hosts.
**Option B:** This option is incorrect because it does not accurately describe the natural reservoir of the JE virus. While the virus can be transmitted between mosquitoes, the primary vector is the _Culex_ mosquito species, which serves as the main reservoir for the virus.
**Option D:** This option is incorrect because it does not specify the role of vertebrate hosts in the JE virus life cycle in nature. While the virus can be transmitted between mosquitoes, the presence of vertebrate hosts is essential for the amplification and replication of the virus.
**Clinical Pearl / High-Yield Fact**
The JE virus life cycle in nature highlights the importance of vector control and prevention of mosquito-borne illnesses. Effective control measures include the use of insecticides, elimination of breeding sites, and implementation of personal protective measures such as wearing long-sleeved clothing and applying insect repellents.
**Correct Answer:** C. Culex mosquito and vertebrate hosts