Is a vaccine needed for japanese encaphilitis virus?

Are you traveling? Japanese encephalitis is endemic in se asia but not in north america. A vaccine is available and may be appropriate depending on your travel plans. See a travel clinic and take their advice as to prevention for this and other exotic infections.
Seek Advice. Most individuals risk for japanese encephalitis is exceedingly low. The incidence in tourists who travel to se asia is approximately 1/ million. Your chances are greatest if you stay in a rural area for a month (less time if extensive outdoor or nighttime activities) & are near rice paddies & pig farms. These last two are part of the virus life cycle-- pigs and wading birds- then consider vaccine.
No. Maintain good health by proper diet and exercise and any viral infection, even colds, are much less likely.