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Unvaccinated Children Are an Important Link in the Transmission of SARS-CoV-2 Delta Variant (B1.617.2): Comparative Clinical Evidence From a Recent Community Surge.
Li, Hongru; Lin, Haibin; Chen, Xiaoping; Li, Hang; Li, Hong; Lin, Sheng; Huang, Liping; Chen, Gongping; Zheng, Guilin; Wang, Shibiao; Hu, Xiaowei; Huang, Handong; Tu, Haijian; Li, Xiaoqin; Ji, Yuejiao; Zhong, Wen; Li, Qing; Fang, Jiabin; Lin, Qunying; Yu, Rongguo; Xie, Baosong.
  • Li H; Department of Respiratory and Critical Care Medicine, Fujian Provincial Hospital, Fujian Shengli Medical College, Fujian Medical University, Fuzhou, China.
  • Lin H; Department of Orthopaedics, Affiliated Hospital of Fujian Putian University, Putian, China.
  • Chen X; College of Mathematics and Statistics, Fujian Normal University, Fuzhou, China.
  • Li H; Department of Orthopaedics, Affiliated Hospital of Fujian Putian University, Putian, China.
  • Li H; Nursing Department, Fujian Provincial Hospital, Fuzhou, China.
  • Lin S; Department of Respiratory and Critical Care Medicine, Fujian Provincial Hospital, Fujian Shengli Medical College, Fujian Medical University, Fuzhou, China.
  • Huang L; Department of Respiratory and Critical Care Medicine, Fujian Provincial Hospital, Fujian Shengli Medical College, Fujian Medical University, Fuzhou, China.
  • Chen G; Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Fujian Medical University, Fuzhou, China.
  • Zheng G; Department of Respiratory and Critical Care Medicine, Affiliated Hospital of Putian University, Putian, China.
  • Wang S; Department of Pediatrics, Fujian Maternal and Child Health Hospital, Fuzhou, China.
  • Hu X; Fujian Hospital of Shanghai Children's Medical Center, Fuzhou, China.
  • Huang H; Department of Internal Critical Medicine, Affiliated Hospital of Putian University, Putian, China.
  • Tu H; Department of Laboratory Medicine, Affiliated Hospital of Putian University, Putian, China.
  • Li X; Department of Respiratory and Critical Care Medicine, Fujian Provincial Hospital, Fujian Shengli Medical College, Fujian Medical University, Fuzhou, China.
  • Ji Y; College of Mathematics and Statistics, Fujian Normal University, Fuzhou, China.
  • Zhong W; Department of Respiratory and Critical Care Medicine, Fujian Provincial Hospital, Fujian Shengli Medical College, Fujian Medical University, Fuzhou, China.
  • Li Q; Department of Respiratory and Critical Care Medicine, Fujian Provincial Hospital, Fujian Shengli Medical College, Fujian Medical University, Fuzhou, China.
  • Fang J; Department of Respiratory and Critical Care Medicine, Fujian Provincial Hospital, Fujian Shengli Medical College, Fujian Medical University, Fuzhou, China.
  • Lin Q; Department of Respiratory and Critical Care Medicine, Affiliated Hospital of Putian University, Putian, China.
  • Yu R; Department of Surgical Critical Medicine, Fujian Provincial Hospital, Fuzhou, China.
  • Xie B; Department of Respiratory and Critical Care Medicine, Fujian Provincial Hospital, Fujian Shengli Medical College, Fujian Medical University, Fuzhou, China.
Front Cell Infect Microbiol ; 12: 814782, 2022.
Article in English | MEDLINE | ID: covidwho-2162957
ABSTRACT

Objective:

To evaluate the necessity of Covid-19 vaccination in children aged < 12 y by comparing the clinical characteristics between unvaccinated children aged < 12 y and vaccinated patients aged ≥ 12y during the Delta surge (B.1.617.2) in Putian, Fujian, China.

Methods:

A total of 226 patients with SARS-Cov-2 Delta variant (B.1.167.2; confirmed by Real-time PCR positivity and sequencing) were enrolled from Sep 10th to Oct 20th, 2021, including 77 unvaccinated children (aged < 12y) and 149 people aged ≥ 12y, mostly vaccinated. The transmission route was explored and the clinical data of two groups were compared; The effect factors for the time of the nucleic acid negativization (NAN) were examined by R statistical analysis.

Results:

The Delta surge in Putian spread from children in schools to factories, mostly through family contact. Compared with those aged ≥ 12y, patients aged < 12y accounted for 34.07% of the total and showed milder fever, less cough and fatigue; they reported higher peripheral blood lymphocyte counts [1.84 (1.32, 2.71)×10^9/L vs. 1.31 (0.94, 1.85)×10^9/L; p<0.05), higher normal CRP rate (92.21% vs. 57.72%), lower IL-6 levels [5.28 (3.31, 8.13) vs. 9.10 (4.37, 15.14); p<0.05]. Upon admission, their COVID19 antibodies (IgM and IgG) and IgG in convalescence were lower [0.13 (0.00, 0.09) vs. 0.12 (0.03, 0.41), p<0.05; 0.02 (0.00, 0.14) vs. 1.94 (0.54, 6.40), p<0.05; 5.46 (2.41, 9.26) vs. 73.63 (54.63, 86.55), p<0.05, respectively], but longer NAN time (18 days vs. 16 days, p=0.13).

Conclusion:

Unvaccinated children may be an important link in the transmission of SARS-CoV-2 delta variant (B1.617.2), which indicated an urgent need of vaccination for this particular population.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: SARS-CoV-2 / COVID-19 Type of study: Experimental Studies / Prognostic study / Randomized controlled trials Topics: Vaccines / Variants Limits: Aged / Child / Humans Language: English Journal: Front Cell Infect Microbiol Year: 2022 Document Type: Article Affiliation country: Fcimb.2022.814782

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Full text: Available Collection: International databases Database: MEDLINE Main subject: SARS-CoV-2 / COVID-19 Type of study: Experimental Studies / Prognostic study / Randomized controlled trials Topics: Vaccines / Variants Limits: Aged / Child / Humans Language: English Journal: Front Cell Infect Microbiol Year: 2022 Document Type: Article Affiliation country: Fcimb.2022.814782