ArticleBMC infectious diseases2024
High SARS-CoV-2 infection rate in children unvaccinated with COVID-19 vaccine in Changzhou, China, shortly after lifting zero-COVID-19 policy in December 2022.
Article in BMC infectious diseases, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed.
- Anti-SARS-CoV-2 response in alveolar blood sample and bronchoalveolar lavage fluid of individuals vaccinated with inactivated COVID-19 vaccines.Human vaccines & immunotherapeutics · 2026Article
- SARS-CoV-2 infection in dogs, dog owners, dog breeders, and veterinarians in the Ashanti and Greater Accra regions of Ghana-zoonotic implications.Frontiers in veterinary science · 2026Article
- Transcriptomic profiling reveals immune signatures associated with potential COVID-19 susceptibility and a predictive framework in a Chinese cohort.Frontiers in immunology · 2026Article
- Immune response to and virological profile of SARS-CoV-2 before and after symptom onset in individuals vaccinated with inactivated COVID-19 vaccines.Human vaccines & immunotherapeutics · 2025Article
- Risk of intrauterine transmission and pregnancy outcomes following SARS-CoV-2 infection in the first or second trimester: a prospective cohort study.BMC pregnancy and childbirth · 2025Article
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Authors and funding
7 authors.
Funding
Abstract
backgroundChina experienced an overwhelming COVID-19 pandemic from middle December 2022 to middle January 2023 after lifting the zero-COVID-19 policy on December 7, 2022. However, the infection rate was less studied. We aimed to investigate the SARS-CoV-2 infection rate in children shortly after discontinuation of the zero-COVID-19 policy.
methodsFrom February 20 to April 10, 2023, we included 393 children aged 8 months to less than 3 years who did not receive COVID-19 vaccination and 114 children aged 3 to 6 years who received inactivated COVID-19 vaccines based on the convenience sampling in this cross-sectional study. IgG and IgM antibodies against nucleocapsid (N) and subunit 1 of spike (S1) of SARS-CoV-2 (anti-N/S1) were measured with commercial kits (Shenzhen YHLO Biotech, China).
resultsOf the 393 unvaccinated children (1.5 ± 0.6 years; 52.2% boys), 369 (93.9%) were anti-N/S1 IgG positive. Of the 114 vaccinated children (5.3 ± 0.9 years; 48.2% boys), 112 (98.2%) were anti-N/S1 IgG positive. None of the unvaccinated or vaccinated children was anti-N/S1 IgM positive. The median IgG antibody titers in vaccinated children (344.91 AU/mL) were significantly higher than that in unvaccinated children (42.80 AU/mL) (P < 0.0001). The positive rates and titers of anti-N/S1 IgG had no significant difference between boys and girls respectively.
conclusionVast majority of children were infected with SARS-CoV-2 shortly after ending zero-COVID-19 policy in China. Whether these unvaccinated infected children should receive COVID-19 vaccine merits further investigation.
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