COVID-19 Seroprevalence and Low-Level Neutralizing Antibodies in Shanghai Community Residents

Strategic Insights -

Shanghai's community residents have been found to have a high seropositivity rate of neutralizing antibodies (NAb) against SARS-CoV-2, with 97.58% of participants testing positive. The study, conducted by the Shanghai Municipal Center for Disease Control and Prevention, also revealed that age, infection history, and vaccination status are correlated with low-level NAb. The research suggests that booster immunization can reduce the risk of low-level NAb, and it is recommended that eligible individuals, particularly the elderly, receive timely vaccination to exert the protective role of NAb.

Key Takeaways:

  • The study included 2,230 participants from the Shanghai community, covering all age groups (0-14, 15-24, 25-59, and 60 years old).
  • The positive rate of NAb was 97.58%, with 25.02% (558/2,230) testing positive for low-level NAb.
  • Multivariate logistic regression analysis indicated that age, infection history, and vaccination status were correlated with low-level NAb (all P < 0.05).
  • The study found that booster immunization can reduce the risk of low-level NAb, regardless of infection history.
  • The research recommended that eligible individuals, especially the elderly, should receive timely vaccination to exert the protective role of NAb.
  • Additional authors for the research include ZHANG Jingyi, WU Huanyu, WANG Weibing, ZHAO Genming, YU Xiao, MA Xiaoying, CHEN Min, SUN Xiaodong, HUANG Zhuoying, MA Zhonghui, ZHENG Yaxu, and CHEN Jian.

Statistics:

  • 2,230 participants were included in the study, covering diverse age groups.
  • The positive rate of NAb was 97.58%, indicating a high seropositivity rate in the community.
  • 25.02% (558/2,230) tested positive for low-level NAb.
  • 97% (all P < 0.05) of factors were correlated with low-level NAb.
  • 20% proportion of subjects were enrolled by stratified sampling method.

Sources:

  • Seroprevalence and influencing factors of low-level neutralizing antibodies against SARS-CoV-2 in community residents. Shanghai yufang yixue, 2025, 37(5):403-409. The publisher for Shanghai yufang yixue is Shanghai Preventive Medicine Association.
  • Shanghai Municipal Center for Disease Control and Prevention.
  • NewsRx. Research Data from Shanghai Municipal Center for Disease Control and Prevention Update Understanding of COVID-19 (Seroprevalence and influencing factors of low-level neutralizing antibodies against SARS-CoV-2 in community residents). Medical Letter on the CDC & FDA. August 10, 2025; p 163.