If you continue to be at risk of infection, a booster dose of the vaccine should be given 12 to 24 months after you're first vaccinated. More serious side effects, such as a raised, itchy red rash urticaria or hives , swelling of the face and difficulty breathing, are rare. If you develop any worrying symptoms after being vaccinated, contact your GP as soon as possible or call NHS for advice.
Most people can have the Japanese encephalitis vaccination safely, but you should tell the doctor or nurse before being vaccinated if you have a high temperature fever , or if you're pregnant or breastfeeding. It may also not be recommended if you're pregnant or breastfeeding as there's a theoretical risk of problems resulting from the vaccine being passed to your baby.
The Japanese encephalitis vaccine is not usually recommended for children less than 2 months old because it's unclear how safe and effective it is for this age group. You should not have the vaccine if you have had a severe allergic reaction anaphylaxis to it or any of its ingredients in the past. Various types of insect repellent are available. Page last reviewed: 01 February Next review due: 01 February Japanese encephalitis JE vaccine can prevent Japanese encephalitis. Japanese encephalitis occurs mainly in many parts of Asia and the Western Pacific, particularly in rural areas.
Risk is very low for most travelers. It is higher for people living in areas where the disease is common, or for people traveling there for long periods of time. Most people infected with JE virus don't have any symptoms. Others might have symptoms as mild as a fever and headache, or as serious as encephalitis swelling of the brain. A person with encephalitis can experience fever, neck stiffness, seizures, and coma. About 1 person in 4 with encephalitis dies.
Up to half of those who don't die have permanent disability for example, brain damage. It should also be considered for travelers spending less than one month in a country where JE occurs, if they:. Many laboratory workers at risk for exposure to JE virus will also require vaccination. The vaccine is given as a 2-dose series. A booster dose is recommended after a year for people who remain at risk. Your health care provider can advise you.
Has had an allergic reaction after a previous dose of JE vaccine , or has any severe, life-threatening allergies. Will be traveling for fewer than 30 days and only traveling to urban areas. You might not need the vaccine. In some cases, your health care provider may decide to postpone JE vaccination to a future visit. People with minor illnesses, such as a cold, may be vaccinated. People who are moderately or severely ill should usually wait until they recover before getting JE vaccine.
People sometimes faint after medical procedures, including vaccination. Tell your provider if you feel dizzy or have vision changes or ringing in the ears. As with any medicine, there is a very remote chance of a vaccine causing a severe allergic reaction, other serious injury, or death. An allergic reaction could occur after the vaccinated person leaves the clinic.
Top of Page. Most people who are infected develop mild symptoms or no symptoms at all. In people who develop severe disease, initial symptoms include fever, chills, headache, fatigue, nausea and vomiting. The disease can progress to inflammation of the brain encephalitis and is often accompanied by seizures. Coma and paralysis occur in some cases. Diagnosis is based on a combination of clinical signs and symptoms and specialized laboratory tests of blood or spinal fluid.
These tests typically detect antibodies that the immune system makes against the viral infection. There is no specific treatment. Severe illnesses are treated by supportive therapy which may include hospitalization, respiratory support, and intravenous fluids. JE vaccine is recommended for persons moving to a JE-endemic country to live, longer-term e.
JE vaccine also should be considered for shorter-term e. Vaccination also should be considered for travelers to endemic areas who are uncertain of specific duration of travel, destinations, or activities. JE vaccine is not recommended for travelers with very low risk itineraries, such as shorter-term travel limited to urban areas or travel that occurs outside of a well-defined JE virus transmission season.
The duration of protection is unknown. A booster dose may be given if the primary two-dose vaccination series was given one year or more previously and there is continued risk of exposure. Pain and tenderness are the most commonly reported symptoms.
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