Monitoring of influenza vaccine effectiveness among Japanese children (2020/21 - 2026/27 season)

Monitoring of influenza vaccine effectiveness among Japanese children (2020/21 - 2026/27 season) - Monitoring of influenza vaccine effectiveness among Japanese children (2020/21 - 2026/27 season)

Status

Recruiting

Phases

Unknown

Study type

Observational

Source

JPRN

Registry ID

JPRN-UMIN000043402

Enrollment

5250

Registered

2021-02-22

Start date

2023-01-23

Completion date

Unknown

Last updated

2026-06-29

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

Conditions

Influenza

Interventions

None listed

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: For 2020/21 to 2022/23 season 1) Children with influenza-like illness (ILI) who visited collaborating pediatric clinics in Osaka/Fukuoka prefecture, Japan, during the 2020/21, 2021/22 and 2022/23 influenza season 2) Aged less than 3 years at the time of visit 3) Those who visited the clinics within 7 days after onset of fever (38.0 degree) For 2023/24 to 2026/27 season 1) Children with influenza-like illness (ILI) who visited collaborating pediatric clinics in Osaka/Fukuoka prefecture, Japan, during the 2020/21, 2021/22 and 2022/23 influenza season 2) Aged less than 6 years at the time of visit 3) Those who visited the clinics within 7 days after onset of fever (38.0 degree)

Exclusion criteria

Exclusion criteria: Subjects are excluded if they: - are aged less than 6 months, as of the last October 1st before each season - have a history of anaphylaxis after influenza vaccination - had been administered influenza antivirals for the current ILI - experienced the current ILI during the hospitalization - are institutionalized - are non-residents in Osaka/Fukuoka prefecture, Japan - are judged to be inappropriate for participation by doctors in charge

Design outcomes

Primary

Measure	Time frame
Laboratory-confirmed influenza	—

Countries

Japan

Contacts

Public ContactWakaba Fukushima

Osaka Metropolitan University Graduate School of Medicine Department of Public Health

wakaba@omu.ac.jp06-6645-3756

Outcome results