A Questionnaire-Based Study on the Actual Timing of Initiation of Japanese Encephalitis Vaccination

Status

Active, not recruiting

Phases

Unknown

Study type

Observational

Source

JPRN

Registry ID

JPRN-jRCT1070250109

Enrollment

2700

Registered

2025-12-04

Start date

2025-12-04

Completion date

Unknown

Last updated

2026-09-14

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Japanese Encephalitis

Interventions

None listed

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: 1.Parents registered as panel members of Macromill Inc. who have children aged 4 to 6 years 2.Individuals who agreed, at the time of the survey, to allow anonymized survey results to be published in academic literature 3.Individuals who can confirm the month of the first dose of the Japanese encephalitis vaccine for their 4 to 6 year-old child using the Maternal and Child Health Handbook

Exclusion criteria

Exclusion criteria: none

Design outcomes

Primary

Measure	Time frame
Proportion of individuals who initiated the first dose of Japanese encephalitis vaccine before age 3, nationwide and by regional block	—

Secondary

Measure	Time frame
Proportion of individuals who started vaccination before the age of 3 within each block (by prefecture) Annual trend in the proportion of individuals who started vaccination before the age of 3 (nationwide and by block) Proportion of reasons for not receiving vaccination among unvaccinated individuals Proportion of individuals who started vaccination before the age of 3 according to sources of information influencing vaccination decision (doctor's guidance, municipal notifications, SNS, vaccination schedule apps) (nationwide and by block) For cases where the source of information influencing vaccination decision was doctor's guidance: proportion of individuals who started vaccination before the age of 3 according to opportunities for guidance from medical institutions (during health checkups, after other vaccinations, during illness visits) (nationwide and by block) For cases where the source of information influencing vaccination decision was municipal notifications: proportion of individuals who started vaccination before the age of 3 according to timing of notifications from municipalities (during age 0, age 1, age 2, or after age 3) (nationwide and by block)	—

Measure

Time frame

Proportion of individuals who started vaccination before the age of 3 within each block (by prefecture) Annual trend in the proportion of individuals who started vaccination before the age of 3 (nationwide and by block) Proportion of reasons for not receiving vaccination among unvaccinated individuals Proportion of individuals who started vaccination before the age of 3 according to sources of information influencing vaccination decision (doctor's guidance, municipal notifications, SNS, vaccination schedule apps) (nationwide and by block) For cases where the source of information influencing vaccination decision was doctor's guidance: proportion of individuals who started vaccination before the age of 3 according to opportunities for guidance from medical institutions (during health checkups, after other vaccinations, during illness visits) (nationwide and by block) For cases where the source of information influencing vaccination decision was municipal notifications: proportion of individuals who started vaccination before the age of 3 according to timing of notifications from municipalities (during age 0, age 1, age 2, or after age 3) (nationwide and by block)

—

Contacts

Public ContactUno Shingo

KM Biologics Co., Ltd.

uno-shi@kmbiologics.com+81-968-37-4079

Outcome results