Articles Vol. 67 No. CĐ7-Trường ĐH Y Dược Hải Phòng 06/07/2026

CURRENT STATUS OF SEASONAL INFLUENZA VACCINATION AND ASSOCIATED FACTORS AMONG CHILDREN AGED 6 MONTHS TO UNDER 5 YEARS AT PHU THO PROVINCIAL CHILDREN'S HOSPITAL IN 2022

Tran Thi Thuy Linh1,2, Nguyen Hai Nam1,2, Hoang An Duong1,2
1 Phu Tho Provincial Hospital of Obstetrics and Pediatrics
2 Bệnh viện Sản nhi tỉnh Phú Thọ
DOI: 10.52163/yhc.v67iCD7.5640
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Keywords
seasonal influenza vaccine, children, immunization, associated factors, adverse events following immunization
Abstract

Objective: To describe the current status of seasonal influenza vaccination, identify associated factors, and assess post-vaccination reactions among children aged 6 months to under 5 years at Phu Tho Obstetrics and Pediatrics Hospital in 2022.

Methods: A cross-sectional descriptive study was conducted on 3,801 children aged 6 months to under 5 years attending the vaccination center from September 2021 to August 2022. Data were collected from immunization records and supplemented by interviews when necessary. Descriptive statistics and Chi-square tests were used for analysis, with p < 0.05 considered statistically significant.

Results: The proportion of children receiving at least one dose of influenza vaccine was 67.5%. Among vaccinated children, those aged under 3 years accounted for 86.4%, and 73.0% resided in urban areas. The proportion of incomplete primary vaccination remained high (64.9%), while the booster vaccination rate was very low (0.4%). Maternal education level and household economic status were significantly associated with vaccine uptake (p < 0.05). Post-vaccination reactions were mostly mild, with the most common being local pain/swelling (17.5%) and vomiting (12.9%), typically occurring within the first day. Fever was uncommon (1.2%) and generally mild.

Conclusion: Influenza vaccine uptake was relatively high; however, completion of the primary series and booster doses remained suboptimal. Socioeconomic factors and vaccine availability played important roles. The vaccine demonstrated a favorable safety profile with mostly mild, self-limited reactions.

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