Risk assessment for Japanese encephalitis vaccination

Area of Science:

• Virology
• Epidemiology
• Public Health

Background:

• Japanese encephalitis (JE) is the most frequent viral encephalitis diagnosis in Asia.
• The disease is caused by the Japanese encephalitis virus (JEV), a Flavivirus transmitted by Culex mosquitoes.
• Neutralizing antibodies against JEV, inducible via vaccination, confer protection.

Purpose of the Study:

• To inform travelers about the risks associated with Japanese encephalitis.
• To highlight the severity of JE, including high mortality and neurological damage.
• To guide healthcare providers in discussing JE risks with travelers to endemic areas.

Main Methods:

• This abstract is based on existing knowledge regarding JE epidemiology and clinical outcomes.
• Information synthesis on JEV transmission, disease presentation, and traveler risk assessment.
• Review of JE's impact on travelers, emphasizing severity and potential for life-altering consequences.

Main Results:

• JE poses a significant threat to travelers in endemic regions of South and Southeast Asia and Pacific Islands.
• Risk increases with mosquito exposure and duration of stay during active transmission seasons.
• Although rare in travelers, JE has a high mortality rate (approximately 1 in 3) and frequently results in permanent neurological deficits.

Conclusions:

• JE can be a life-altering event for travelers due to its high severity.
• Healthcare providers must carefully explain the profound consequences of JE to travelers.
• Informed decision-making requires balancing the low probability of infection against the severe outcomes of the disease.