Association between influenza vaccination during pregnancy from 2012 to 2022 and demographic characteristics and preterm birth outcomes in Shanghai

This study, published in Vaccine by Prof. Weibing Wang and team from Fudan University, in collaboration with the Shanghai Municipal Center of Disease Control and

This study, led by Prof. Jing Li from Sichuan University and Prof. Dan Wu from Nanjing Medical University, was published in PLOS Medicine. Conducted in four community health centers in Chengdu, western China, this randomized controlled trial evaluated the impact of a “pay-it-forward” intervention on HPV vaccination among girls aged 15–18 years. Participants in the intervention arm received a community subsidy for their first HPV vaccine dose and were invited to donate and write encouragement postcards for future recipients, while the control arm self-paid at market price. The pay-it-forward approach increased first-dose uptake from 17.5% to 34.2%, significantly reduced vaccination delay, and enhanced vaccine confidence. Most families in the intervention arm engaged in donations and message sharing, and the cost per person vaccinated was lower than in the control group. Findings suggest that this community-engaged, reciprocity-based model is an effective and sustainable strategy to improve HPV vaccination coverage among catch-up age girls, with potential for broader implementation.

This study from Fudan University School of Public Health and the Shanghai CDC, published in Human Vaccines & Immunotherapeutics, leveraged the city’s immunization registry to conduct a retrospective cohort analysis of children born between September 1, 2018 and August 30, 2023. Children were classified by the COVID-19 phase at their expected vaccination dates (pre/post-epidemic, baseline, epidemic). Three pertussis-containing vaccines were included, namely, DTP, DTP-Hib, and DTP-IPV-Hib. Kaplan–Meier estimators and multivariable Cox models showed marked declines in timeliness when vaccination windows coincided with epidemic phases—for example, at 2 months the probability of timely vaccination was 0.89 (95% CI 0.86–0.92) during baseline vs 0.53 (95% CI:0.51–0.55) during epidemic periods; hazard ratios for timely vaccination at 3 and 5 months decreased by 12% (HR=0.88, 95% CI:0.86–0.90) and 9% (HR=0.91, 95% CI:0.87–0.94) in baseline vs pre/post, and by 49% (HR=0.51, 95% CI:0.49–0.53) and 57% (HR=0.43, 95% CI:0.40–0.46) during epidemic periods. Findings underscore the need for targeted catch-up and service-continuity measures to mitigate disruptions to routine childhood immunization.