**Question:** False about Japanese encephalitis is:

A. Japanese encephalitis affects only adults
B. Japanese encephalitis is a viral infection in pigs
C. Japanese encephalitis is a viral infection transmitted by Aedes mosquitoes
D. Japanese encephalitis has no vaccine or antiviral treatment

**Correct Answer:** C. Japanese encephalitis is a viral infection transmitted by Aedes mosquitoes

**Core Concept:**
Japanese encephalitis (JE) is a viral infection caused by the Japanese encephalitis virus (JEV), which belongs to the Flaviviridae family and is transmitted to humans through the bite of infected mosquitoes, specifically Aedes and Culex species. JE is a neuroinvasive disease with potential to cause severe encephalitis and high mortality rates.

**Why the Correct Answer is Right:**
The correct answer (option C) highlights the primary mode of transmission for Japanese encephalitis. The virus is transmitted to humans via the bite of infected mosquitoes, mainly Aedes and Culex species. In contrast, option A states that Japanese encephalitis affects only adults, which is inaccurate, as the disease can affect individuals of all age groups, including children and adults. Options B and D are related to the pathogenesis and treatment of the disease, which is not the focus of this question.

**Why Each Wrong Option is Incorrect:**

A. False: Japanese encephalitis affects individuals of all age groups, including children and adults.
B. False: Japanese encephalitis is primarily a viral infection in pigs; it primarily affects humans and horses.
D. False: There is a vaccine (Japanese Encephalitis vaccine) available to protect against the disease, and antiviral therapy may be considered in severe cases.

**Clinical Pearl:**
Japanese encephalitis is a significant public health concern in parts of Asia, particularly in countries like India, Bangladesh, Nepal, Sri Lanka, and Vietnam. This disease is responsible for large outbreaks of encephalitis and can cause substantial morbidity and mortality. Vaccination is crucial in endemic areas to prevent infection. Additionally, early diagnosis and treatment are essential to reduce the mortality rate and improve patient outcomes.