320 healthy pupils were examined at two primary school and secondary school in Tan Tien commune, An Hai district, Hai Phong city, among them 257 pupils were selected. Those pupils were divided randomly into 4 groups. There was the age from 6 to 14 in each group. JE vaccine produced by National Institute of Hygiene and Epidemiology, Hanoi was vaccinated three times: first dose and second dose with a week interval, third dose a year after with different doses: 1ml, 0.75ml, 0.5ml and 0.1ml, for children of age from 6 to 14. The side effect mainly was slight pain on the injection's spot. Almost of cases had slight fever (< 380C), during only 1-2 days after injection
Japanese Encephalitis Vaccines ; adverse effects ; epidemiology ; Pupil ; child

We report a three-year-old Korean boy who presented with itching symmetrical erythematous macules and papules on his face, trunk, and extremities for 1 week. Lymphadenopathies were detected on physical examination. He was vaccinated against Japanese B Encephalitis (JE) 1 day before developing skin rashes. The patient's serum JE antibody titer by hemagglutinin inhibition (HI) test was 1:40. Under the diagnosis of Gianotti-Crosti syndrome following JE vaccination, he was conservatively treated with an antihistamine agent, and his symptoms were all cleared 2 weeks after treatment.
Acrodermatitis/*etiology ; Child, Preschool ; Encephalitis, Japanese/*prevention & control ; Human ; Japanese Encephalitis Vaccines/*adverse effects ; Male

OBJECTIVEUsing the advantages of Japanese encephalitis live attenuated and inactivated vaccine, to reduce the rate of immunization reaction and to increase the effect, we conducted a study on the strategy of immunization in Japanese encephalitis using live attenuated vaccine combined with inactivated vaccine.

METHODSObserving the safety and immune effects of different groups.

RESULTSData on side effect showed that the rate of moderate and severe systematic reactions of the group who were inoculated with combined vaccine was 0.73%, with local reaction 1.46% while the combined rate of moderate and severe systematic reaction of the group who were inoculated with inactivated vaccine was 2.8%. Under the detection of serum neutralizing antibody, the GMT rose from 1:1.05 - 1:3.35 before vaccination to 1:47.34 - 1:101.30 after vaccination in the different groups. Neutralizing antibody was detected in 97.67% of the combined group. There was a significant difference by comparing neutralizing antibody seroconversion rate of the combined group with the inactivated group (chi(2) = 3.89, P < 0.05), but no significant difference with attenuated group (chi(2) = 0.74, P > 0.05).

CONCLUSIONResults showed that in children who previously had been immunized with two doses of inactivated vaccine, the booster administration of live attenuated vaccine was both effective and safe.

Antibodies, Viral ; blood ; Child, Preschool ; Encephalitis Virus, Japanese ; immunology ; Humans ; Immunization ; Japanese Encephalitis Vaccines ; administration & dosage ; adverse effects ; immunology ; Vaccines, Attenuated ; immunology ; Vaccines, Inactivated ; immunology

OBJECTIVETo study the viremia formation in guinea-pigs infected with wild type and attenuated Japanese encephalitis virus (JEV).

METHODSGuniea pigs were inoculated intraperitoneally with different wild JEV strains and the attenuated vaccine strain and its parent virulent strain. Viremia was detected on different days following virus inoculation.

RESULTSAll the guinea-pigs inoculated with the wild JEV strains induced different levels of viremia (1.00-3.40 Lg pfu) on the 1st and 3rd day post inoculation. Using a virus titer of 10(4) pfu for inoculation, the animals inoculated with the SA14 parent strain induced relatively high viremia (10(2.4)-10(3.4) pfu), however no viremia coulds be detected on any tested days.

CONCLUSIONThe degree of viremia in guinea pigs can be used as a new method to evaluate the attenuation of JEV.

Animals ; Disease Models, Animal ; Encephalitis Virus, Japanese ; pathogenicity ; physiology ; Encephalitis, Japanese ; virology ; Guinea Pigs ; Humans ; Japanese Encephalitis Vaccines ; administration & dosage ; adverse effects ; Vaccines, Attenuated ; administration & dosage ; adverse effects ; Viremia ; virology ; Virulence ; Virus Replication