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Aparicio C, Willis ZI, Nakamura MM, Wolf J, Little C, Maron GM, Sue PK, Anosike BI, Miller C, Bio LL, Singh P, James SH, Oliveira CR. Risk Factors for Pediatric Critical COVID-19: A Systematic Review and Meta-Analysis. J Pediatric Infect Dis Soc 2024; 13:352-362. [PMID: 38780125 DOI: 10.1093/jpids/piae052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2023] [Accepted: 05/21/2024] [Indexed: 05/25/2024]
Abstract
BACKGROUND Risk stratification is a cornerstone of the Pediatric Infectious Diseases Society COVID-19 treatment guidance. This systematic review and meta-analysis aimed to define the clinical characteristics and comorbidities associated with critical COVID-19 in children and adolescents. METHODS Two independent reviewers screened the literature (Medline and EMBASE) for studies published through August 31, 2023, that reported outcome data on patients aged ≤21 years with COVID-19. Critical disease was defined as an invasive mechanical ventilation requirement, intensive care unit admission, or death. Random-effects models were used to estimate pooled odds ratios (OR) with 95% confidence intervals (CI), and heterogeneity was explored through subgroup analyses. RESULTS Among 10,178 articles, 136 studies met the inclusion criteria for review. Data from 70 studies, which collectively examined 172,165 children and adolescents with COVID-19, were pooled for meta-analysis. In previously healthy children, the absolute risk of critical disease from COVID-19 was 4% (95% CI, 1%-10%). Compared with no comorbidities, the pooled OR for critical disease was 3.95 (95% CI, 2.78-5.63) for the presence of one comorbidity and 9.51 (95% CI, 5.62-16.06) for ≥2 comorbidities. Key risk factors included cardiovascular and neurological disorders, chronic pulmonary conditions (excluding asthma), diabetes, obesity, and immunocompromise, all with statistically significant ORs > 2.00. CONCLUSIONS While the absolute risk for critical COVID-19 in children and adolescents without underlying health conditions is relatively low, the presence of one or more comorbidities was associated with markedly increased risk. These findings support the importance of risk stratification in tailoring pediatric COVID-19 management.
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Affiliation(s)
- Camila Aparicio
- Department of Pediatrics, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Zachary I Willis
- Department of Pediatrics, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA
| | - Mari M Nakamura
- Antimicrobial Stewardship Program and Division of Infectious Diseases, Boston Children's Hospital, Boston, Massachusetts, USA
| | - Joshua Wolf
- Department of Infectious Diseases, St. Jude Children's Research Hospital and Department of Pediatrics, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Cordell Little
- Department of Pediatrics, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Gabriela M Maron
- Department of Infectious Diseases, St. Jude Children's Research Hospital and Department of Pediatrics, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Paul K Sue
- Department of Pediatrics, Columbia University Irving Medical Center, New York, New York, USA
| | - Brenda I Anosike
- Department of Pediatrics, The Children's Hospital at Montefiore and Albert Einstein College of Medicine, Bronx, New York, USA
| | - Christine Miller
- Department of Pediatrics, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Laura L Bio
- Department of Pharmacy, Lucile Packard Children's Hospital, Stanford, California, USA
| | - Prachi Singh
- Department of Pediatrics, University of California San Francisco, San Francisco, California, USA
| | - Scott H James
- Department of Pediatrics, Division of Pediatric Infectious Diseases, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Carlos R Oliveira
- Department of Pediatrics, Yale University School of Medicine, New Haven, Connecticut, USA
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Gregorio GEV, Catacutan AMB, Perez MLM, Dans LF. Efficacy, Effectiveness, and Safety of COVID-19 Vaccine Compared to Placebo in Preventing COVID-19 Infection among 12-17 Years Old: A Systematic Review. ACTA MEDICA PHILIPPINA 2024; 58:41-53. [PMID: 38882914 PMCID: PMC11168957 DOI: 10.47895/amp.v58i7.7930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/18/2024]
Abstract
Objectives The World Health Organization recently revised their recommendations and considered healthy children and adolescents as low priority group for COVID-19 vaccine. This review comprehensively assessed existing clinical evidence on COVID-19 vaccine in 12-17 years old. Methods Included in this review were any type of study that investigated the efficacy, immunogenicity, safety, and effectiveness of COVID-19 vaccine on protection against SARS-COV-2 infection in 12-17 years old. Various electronic databases were searched up to March 15, 2023. Studies were screened, data extracted, risk of bias appraised, and certainty of evidence was judged using GRADE. Review Manager 5.4 was used to estimate pooled effects. Difference between the two groups was described as mean difference for continuous variables and as relative risk or odds ratio for categorical variables. Results There were six randomized controlled trials and 16 effectiveness studies (8 cohorts and 8 case control). Low certainty evidence showed that BNT162b2 (Pfizer) was effective, immunogenic, and safe in healthy adolescents. There were 15 effectiveness studies on BNT162b2 (Pfizer) in healthy adolescent and one on immunocompromised patients. It was protective against infection with any of the variants, with higher protection against Delta than Omicron. BNT162b2 is protective against hospitalization and emergency and urgent care (high certainty); and critical care and MIS-C (low). Very low certainty evidence noted that BNT 162b2 was also immunogenic in 12-21 years old with rheumatic diseases while on immunomodulatory treatment but with possible increased exacerbation of illness. Low certainty evidence demonstrated that mRNA-1273 (Moderna) was effective, immunogenic, and safe. Low to very low certainty evidence were noted on the safety and immunogenicity of two vector base vaccines (ChAdOx1-19 and Ad5 vector COVID vaccine) and two inactivated vaccines (CoronaVac and BBIBP CorV). CONCLUSION There is presently low certainty evidence on the use of RNA vaccines in 12-17 years old. The recommendation on its use is weak. There is presently insufficient evidence for the use of inactivated and vector-based COVID-19 vaccines. Different countries should consider whether to vaccinate healthy adolescent without comprising the other recommended immunization and health priorities that are crucial for this age group. Other factors including cost-effectiveness of vaccination and disease burden should be accounted.
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Affiliation(s)
- Germana Emerita V Gregorio
- Division of Pediatric Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, College of Medicine and Philippine General Hospital, University of the Philippines Manila
| | | | - Ma Lucila M Perez
- Clinical Trials and Research Division, Philippine Children's Medical Center, Quezon City
- College of Medicine, St. Luke's Medical Center, Quezon City
| | - Leonila F Dans
- Division of Pediatric Rheumatology, Department of Pediatrics, College of Medicine and Philippine General Hospital, University of the Philippines Manila
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Aparicio C, Willis ZI, Nakamura MM, Wolf J, Little C, Maron GM, Sue PK, Anosike BI, Miller C, Bio LL, Singh P, James SH, Oliveira CR. Risk Factors for Pediatric Critical COVID-19: A Systematic Review and Meta-Analysis. MEDRXIV : THE PREPRINT SERVER FOR HEALTH SCIENCES 2024:2024.01.17.24301452. [PMID: 38293040 PMCID: PMC10827273 DOI: 10.1101/2024.01.17.24301452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2024]
Abstract
Background Risk stratification is a cornerstone of the Pediatric Infectious Diseases Society COVID-19 treatment guidance. This systematic review and meta-analysis aimed to define the clinical characteristics and comorbidities associated with critical COVID-19 in children and adolescents. Methods Two independent reviewers screened the literature (Medline and EMBASE) for studies published through August 2023 that reported outcome data on patients aged ≤21 years with COVID-19. Critical disease was defined as an invasive mechanical ventilation requirement, intensive care unit admission, or death. Random effects models were used to estimate pooled odds ratios (OR) with 95% confidence intervals (CI), and heterogeneity was explored through subgroup analyses. Results Among 10,178 articles, 136 studies met the inclusion criteria for review. Data from 70 studies, which collectively examined 172,165 children and adolescents with COVID-19, were pooled for meta-analysis. In previously healthy children, the absolute risk of critical disease from COVID-19 was 4% (95% CI, 1%-10%). Compared with no comorbidities, the pooled OR for critical disease was 3.95 (95% CI, 2.78-5.63) for presence of one comorbidity and 9.51 (95% CI, 5.62-16.06) for ≥2 comorbidities. Key risk factors included cardiovascular and neurological disorders, chronic pulmonary conditions (excluding asthma), diabetes, obesity, and immunocompromise, all with statistically significant ORs >2.00. Conclusions While the absolute risk for critical COVID-19 in children and adolescents without underlying health conditions is relatively low, the presence of one or more comorbidities was associated with markedly increased risk. These findings support the importance of risk stratification in tailoring pediatric COVID-19 management.
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Affiliation(s)
- Camila Aparicio
- Department of Pediatrics, Yale University School of Medicine, New Haven, CT
| | - Zachary I. Willis
- Department of Pediatrics, University of North Carolina School of Medicine, Chapel Hill, NC
| | - Mari M. Nakamura
- Antimicrobial Stewardship Program and Division of Infectious Diseases, Boston Children’s Hospital, Boston, MA
| | - Joshua Wolf
- Department of Infectious Diseases, St. Jude Children’s Research Hospital and Department of Pediatrics, University of Tennessee Health Science Center, Memphis, TN
| | - Cordell Little
- Department of Pediatrics, Yale University School of Medicine, New Haven, CT
| | - Gabriela M. Maron
- Department of Infectious Diseases, St. Jude Children’s Research Hospital and Department of Pediatrics, University of Tennessee Health Science Center, Memphis, TN
| | - Paul K. Sue
- Department of Pediatrics, Columbia University Irving Medical Center, New York, NY
| | - Brenda I. Anosike
- Department of Pediatrics, The Children’s Hospital at Montefiore and Albert Einstein College of Medicine, Bronx, NY
| | - Christine Miller
- Department of Pediatrics, Yale University School of Medicine, New Haven, CT
| | - Laura L. Bio
- Department of Pharmacy, Lucile Packard Children’s Hospital, Stanford, CA
| | - Prachi Singh
- Department of Pediatrics, University of California San Francisco, San Francisco, CA
| | - Scott H. James
- Department of Pediatrics, Division of Pediatric Infectious Diseases, University of Alabama at Birmingham, Birmingham, AL
| | - Carlos R. Oliveira
- Department of Pediatrics, Yale University School of Medicine, New Haven, CT
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Lan Z, Yan J, Yang Y, Tang Z, Guo X, Wu Z, Jin Q. Effectiveness of COVID-19 vaccines among children and adolescents against SARS-CoV-2 variants: a meta-analysis. Eur J Pediatr 2023; 182:5235-5244. [PMID: 37768334 DOI: 10.1007/s00431-023-05216-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 09/11/2023] [Accepted: 09/15/2023] [Indexed: 09/29/2023]
Abstract
This systematic review and meta-analysis aimed to evaluate the effectiveness of COVID-19 vaccines among children and adolescents against SARS-CoV-2 variants. We searched PubMed, Embase, Web of Science, the Cochrane Library, and ClinicalTrials.gov for studies published on or before June 20, 2023. Studies evaluating the effectiveness of COVID-19 vaccines in children and adolescents (≤ 18 years of age) were included. Data extraction, quality assessment, and analysis were conducted following PRISMA guidelines. Ten studies were included, comprising five cohort studies (527,778 participants) and four case-control studies (1,477,422 participants). The overall vaccine effectiveness (VE) against SARS-CoV-2 variants was 68% (95% CI = 60-74%). In terms of age, the VE was higher in adolescents aged 12-18 years [69%(95% CI = 61-75%)] than in children aged 5-11 years [44%(95% CI = 1-68%)]. "Fully vaccinated" may offer greater protection than "partially vaccinated," with a VE of 71% (95%CI = 59-79%) and 66% (95%CI = 51-76%), respectively. Conclusion: This meta-analysis presents moderate-quality evidence that the COVID-19 vaccine is effective in safeguarding children and adolescents from the SARS-CoV-2 variant. Being fully vaccinated may offer greater protection than being partially vaccinated. Nevertheless, additional high-quality controlled trials are required to verify this finding. What is Known: • The COVID-19 pandemic has led to the rapid development and deployment of vaccines worldwide. Children and adolescents are a unique population for vaccination, and the effectiveness of vaccines against SARS-CoV-2 variants in this age group is of concern. What is New: • The COVID-19 vaccine is effective in protecting children and adolescents against the SARS-CoV-2 variant. Being fully vaccinated may offer greater protection than being partially vaccinated.
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Affiliation(s)
- Zhibin Lan
- Ningxia Medical University, The General Hospital of Ningxia Medical University, 804 Shengli South Street, Ningxia Hui Autonomous Region, 750004, Yinchuan, China
- Institute of Medical Sciences, General Hospital of Ningxia Medical University, Yinchuan, Ningxia, 750004, China
| | - Jiangbo Yan
- Ningxia Medical University, The General Hospital of Ningxia Medical University, 804 Shengli South Street, Ningxia Hui Autonomous Region, 750004, Yinchuan, China
- Institute of Medical Sciences, General Hospital of Ningxia Medical University, Yinchuan, Ningxia, 750004, China
| | - Yang Yang
- Ningxia Medical University, The General Hospital of Ningxia Medical University, 804 Shengli South Street, Ningxia Hui Autonomous Region, 750004, Yinchuan, China
- Institute of Medical Sciences, General Hospital of Ningxia Medical University, Yinchuan, Ningxia, 750004, China
| | - Zhiqun Tang
- Ningxia Medical University, The General Hospital of Ningxia Medical University, 804 Shengli South Street, Ningxia Hui Autonomous Region, 750004, Yinchuan, China
| | - Xuefang Guo
- Quanzhou Orthopedic-Traumatological Hospital, Quanzhou, China
| | - Zhiqiang Wu
- Quanzhou Orthopedic-Traumatological Hospital, Quanzhou, China
| | - Qunhua Jin
- Ningxia Medical University, The General Hospital of Ningxia Medical University, 804 Shengli South Street, Ningxia Hui Autonomous Region, 750004, Yinchuan, China.
- Institute of Medical Sciences, General Hospital of Ningxia Medical University, Yinchuan, Ningxia, 750004, China.
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McMann T, Wenzel C, Le N, Li Z, Xu Q, Cuomo RE, Mackey T. Detection and Characterization of Web-Based Pediatric COVID-19 Vaccine Discussions and Racial and Ethnic Minority Topics: Retrospective Analysis of Twitter Data. JMIR Pediatr Parent 2023; 6:e48004. [PMID: 38038663 DOI: 10.2196/48004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 09/20/2023] [Accepted: 09/21/2023] [Indexed: 12/02/2023] Open
Abstract
Background Despite pediatric populations representing a smaller proportion of COVID-19 cases and having a less severe prognosis, those belonging to racial and ethnic minority groups are at an increased risk of developing more severe COVID-19-related outcomes. Vaccine coverage is crucial to pandemic mitigation efforts, yet since the start of the COVID-19 pandemic, vaccine hesitancy has increased and routine pediatric immunizations have decreased. Limited research exists on how vaccine hesitancy may contribute to low pediatric COVID-19 vaccine uptake among racial and ethnic minority populations. Objective This study aimed to characterize COVID-19 vaccine-related discussion and sentiment among Twitter users, particularly among racial and ethnic minority users. Methods We used the Twitter application programming interface to collect tweets and replies. Tweets were selected by filtering for keywords associated with COVID-19 vaccines and pediatric-related terms. From this corpus of tweets, we used the Biterm Topic Model to output topics and examined the top 200 retweeted tweets that were coded for pediatric COVID-19 vaccine relevance. Relevant tweets were analyzed using an inductive coding approach to characterize pediatric COVID-19 vaccine-related themes. Replies to relevant tweets were collected and coded. User metadata were assessed for self-reporting of race or ethnic group affiliation and verified account status. Results A total of 863,007 tweets were collected from October 2020 to October 2021. After outputting Biterm Topic Model topics and reviewing the 200 most retweeted tweets, 208,666 tweets and 3905 replies were identified as being pediatric COVID-19 vaccine related. The majority (150,262/208,666, 72.01%) of tweets expressed vaccine-related concerns. Among tweets discussing vaccine confidence, user replies expressing agreement were significantly outweighed by those expressing disagreement (1016/3106, 32.71% vs 2090/3106, 67.29%; P<.001). The main themes identified in the Twitter interactions were conversations regarding vaccine-related concerns including adverse side effects, concerns that the vaccine is experimental or needs more testing and should not be tested on pediatric populations, the perception that the vaccine is unnecessary given the perceived low risk of pediatric infection, and conversations associated with vaccine-related confidence (ie, the vaccine is protective). Among signal tweets and replies, we identified 418 users who self-identified as a racial minority individual and 40 who self-identified as an ethnic minority individual. Among the subcodes identified in this study, the vaccine being protective was the most discussed topic by racial and ethnic minority groups (305/444, 68.7%). Conclusions Vaccine-related concerns can have negative consequences on vaccine uptake and participation in vaccine-related clinical trials. This can impact the uptake and development of safe and effective vaccines, especially among racial and ethnic minority populations.
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Affiliation(s)
- Tiana McMann
- Global Health Program, Department of Anthropology, University of California, San Diego, La Jolla, CA, United States
- Global Health Policy and Data Institute, San Diego, CA, United States
- S-3 Research, San Diego, CA, United States
| | | | - Nicolette Le
- Global Health Program, Department of Anthropology, University of California, San Diego, La Jolla, CA, United States
- Global Health Policy and Data Institute, San Diego, CA, United States
| | - Zhuoran Li
- Global Health Policy and Data Institute, San Diego, CA, United States
- S-3 Research, San Diego, CA, United States
| | - Qing Xu
- Global Health Policy and Data Institute, San Diego, CA, United States
- S-3 Research, San Diego, CA, United States
| | - Raphael E Cuomo
- Global Health Policy and Data Institute, San Diego, CA, United States
- Department of Anesthesiology, School of Medicine, University of California, San Diego, San Diego, CA, United States
| | - Tim Mackey
- Global Health Program, Department of Anthropology, University of California, San Diego, La Jolla, CA, United States
- Global Health Policy and Data Institute, San Diego, CA, United States
- S-3 Research, San Diego, CA, United States
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6
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Reynolds L, Dewey C, Asfour G, Little M. Vaccine efficacy against SARS-CoV-2 for Pfizer BioNTech, Moderna, and AstraZeneca vaccines: a systematic review. Front Public Health 2023; 11:1229716. [PMID: 37942238 PMCID: PMC10628441 DOI: 10.3389/fpubh.2023.1229716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Accepted: 09/15/2023] [Indexed: 11/10/2023] Open
Abstract
The purpose of this systematic review was to report on the vaccine efficacy (VE) of three SARS-CoV-2 vaccines approved by Health Canada: Pfizer BioNTech, Moderna, and AstraZeneca. Four databases were searched for primary publications on population-level VE. Ninety-two publications matched the inclusion criteria, and the extracted data were separated by vaccine type: mRNA vaccines (Pfizer and Moderna) and the AstraZeneca vaccine. The median VE for PCR-positive patients and various levels of clinical disease was determined for the first and second doses of both vaccine types against multiple SARS-CoV-2 variants. The median VE for PCR-positive infections against unidentified variants from an mRNA vaccine was 64.5 and 89%, respectively, after one or two doses. The median VE for PCR-positive infections against unidentified variants from the AstraZeneca vaccine was 53.4 and 69.6%, respectively, after one or two doses. The median VE for two doses of mRNA for asymptomatic, symptomatic, and severe infection against unidentified variants was 85.5, 93.2, and 92.2%, respectively. The median VE for two doses of AstraZeneca for asymptomatic, symptomatic, and severe infection against unidentified variants was 69.7, 71, and 90.2%, respectively. Vaccine efficacy numerically increased from the first to the second dose, increased from the first 2 weeks to the second 2 weeks post-vaccination for both doses, but decreased after 4 months from the second dose. Vaccine efficacy did not differ by person's age.
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Affiliation(s)
- Lia Reynolds
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada
| | - Cate Dewey
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada
| | - Ghaid Asfour
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada
| | - Matthew Little
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada
- School of Public Health and Social Policy, Faculty of Human and Social Development, University of Victoria, Victoria, BC, Canada
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Cinza-Estévez Z, Resik-Aguirre S, Figueroa-Baile NL, Oquendo-Martínez R, Campa-Legrá I, Tejeda-Fuentes A, Rivero-Caballero M, González-García G, Chávez-Chong CO, Alonso-Valdés M, Hernández-Bernal F, Lemos-Pérez G, Campal-Espinosa A, Freyre-Corrales G, Benítez-Gordillo D, Gato-Orozco E, Pérez Bartutis GS, Mesa-Pedroso I, Bueno-Alemani N, Infante-Aguilar E, Rodríguez Reinoso JL, Melo-Suarez G, Limonta-Fernández M, Ayala-Ávila M, Muzio-González VL. Immunogenicity and safety assessment of a SARS-CoV-2 recombinant spike RBD protein vaccine (Abdala) in paediatric ages 3-18 years old: a double-blinded, multicentre, randomised, phase 1/2 clinical trial (ISMAELILLO study). EClinicalMedicine 2023; 63:102160. [PMID: 37649806 PMCID: PMC10462868 DOI: 10.1016/j.eclinm.2023.102160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 07/24/2023] [Accepted: 07/26/2023] [Indexed: 09/01/2023] Open
Abstract
Background COVID-19 in paediatric ages could result in hospitalizations and death. In addition, excluding children from vaccination could turn them into reservoirs of the SARS-COV-2. Safe and effective COVID-19 vaccines are urgently needed for large-scale paediatric vaccination. ISMAELILLO study aimed to evaluate safety and immunogenicity of two strengths of a new recombinant receptor-binding domain (RBD) protein vaccine (Abdala) in paediatric population. Methods A double-blinded, multicentre, randomised, phase 1/2 clinical trial was conducted in nine polyclinics in the province of Camagüey, Cuba. Healthy children and adolescents were stratified according to age (3-11 years old, or 12-18 years old) and they were randomly assigned (1:1; block size four) in two dosage level groups of vaccine to receive three intramuscular doses of 25 μg or 50 μg of RBD, 14 days apart. Main safety endpoint was analyzed as the percentage of serious adverse reactions during vaccination up to 28 days after the third dose (Day 56) in participants who received at least one dose vaccination. The primary immunogenicity endpoint assessed was seroconversion rate of anti-RBD IgG antibody at day 56. The immunogenicity outcomes were assessed in the per-protocol population. This trial is registered with Cuban Public Registry of Clinical Trials, RPCEC00000381. Findings Between July 15, 2021, and August 16, 2021, 644 paediatric subjects were screened, of whom 592 were enrolled after verifying that they met the selection criteria: firstly 88 were included in Phase 1 of the study and 504 who completed Phase 2. The vaccine was well tolerated. Injection site pain was the most frequently reported local event (143 [8·4%] of 1707 total doses applied), taking place in 66/851 (7·8%) in the 25 μg group and in 77/856 (9·0%) in the 50 μg. The most common systemic adverse event (AE) was headache: 23/851 (2·7%) in the 25 μg group and 19/856 (2·2%) in the 50 μg. Reactogenicity was mild or moderate in severity, represented in 75% of cases by local symptoms, completely resolved in the first 24-48 h. Twenty-eight days after the third dose, seroconversion anti-RBD IgG were observed in 98·2% of the children and adolescents (231/234) for the 50 μg group and 98·7% (224/228) for the 25 μg group without differences between both strength. The specific IgG antibody geometric mean titres (GMT) showed higher titres between participants who received Abdala 50 μg (231·3; 95% CI 222·6-240·4) compared to those who received 25 μg (126·7; 95% CI 121·9-131·7). The mean ACE2 inhibition %, were 59·4% for 25 μg, and for 50 μg, 72·9% (p < 0·01). Both strength elicited neutralising activity against the SARS-CoV-2, specifically (18·3; 95% CI 14·7-22·78) for Abdala 25 μg and (36·4; 95% CI 30·26-43·8) for 50 μg to the selected sample analyzed. Interpretation Abdala vaccine was safe and well tolerated at both antigenic strength levels tested in participants aged between 3 and 18 years. Regarding immunogenicity, Abdala Vaccine stimulated the production of specific IgG antibodies against the RBD of SARS-CoV-2 as well as the production of ACE2 inhibition titres and neutralising antibodies (Nab) in children and adolescents. Funding Centre for Genetic Engineering and Biotechnology (CIGB), Havana, Cuba.
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Affiliation(s)
- Zurina Cinza-Estévez
- Centre for Genetic Engineering and Biotechnology, 31 Ave and 158, P.O.Box 6162, 10600, Havana, Cuba
| | | | - Nelvis L. Figueroa-Baile
- Centre for Genetic Engineering and Biotechnology, 31 Ave and 158, P.O.Box 6162, 10600, Havana, Cuba
| | - Rachel Oquendo-Martínez
- Centre for Genetic Engineering and Biotechnology, 31 Ave and 158, P.O.Box 6162, 10600, Havana, Cuba
| | - Ivan Campa-Legrá
- Centre for Genetic Engineering and Biotechnology, 31 Ave and 158, P.O.Box 6162, 10600, Havana, Cuba
| | | | | | | | | | - Marel Alonso-Valdés
- Centre for Genetic Engineering and Biotechnology, 31 Ave and 158, P.O.Box 6162, 10600, Havana, Cuba
| | | | - Gilda Lemos-Pérez
- Centre for Genetic Engineering and Biotechnology, 31 Ave and 158, P.O.Box 6162, 10600, Havana, Cuba
| | - Ana Campal-Espinosa
- Centre for Genetic Engineering and Biotechnology of Camagüey, Ave. Finlay and Circunvalación Norte, Camagüey, Cuba
| | - Giselle Freyre-Corrales
- Centre for Genetic Engineering and Biotechnology, 31 Ave and 158, P.O.Box 6162, 10600, Havana, Cuba
| | | | | | - Greter Susana Pérez Bartutis
- Civilian Defence Scientific Research Centre, Carretera de Jamaica y Autopista Nacional, San José de las Lajas, Mayabeque, Cuba
| | | | | | | | | | - Grettel Melo-Suarez
- Centre for Genetic Engineering and Biotechnology, 31 Ave and 158, P.O.Box 6162, 10600, Havana, Cuba
| | | | - Marta Ayala-Ávila
- Centre for Genetic Engineering and Biotechnology, 31 Ave and 158, P.O.Box 6162, 10600, Havana, Cuba
| | - Verena L. Muzio-González
- Centre for Genetic Engineering and Biotechnology, 31 Ave and 158, P.O.Box 6162, 10600, Havana, Cuba
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8
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Wen J, Du X, Li A, Zhang S, Shen S, Zhang Z, Yang L, Sun C, Li J, Zhu S. Dilemmas and options for COVID-19 vaccination in children. Ital J Pediatr 2023; 49:103. [PMID: 37620892 PMCID: PMC10464401 DOI: 10.1186/s13052-023-01513-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/25/2023] [Accepted: 08/19/2023] [Indexed: 08/26/2023] Open
Abstract
Over 16 million children have been detected positive for the coronavirus disease 2019 (COVID-19) in the United States since the outbreak of the pandemic. In general, children infected with severe acute respiratory syndrome coronavirus type 2 tend to have lighter symptoms than adults. However, in some cases, the infection can develop into severe forms, such as multisystem inflammatory syndrome in children. Moreover, long-term public health preventive interventions have had some negative effects on the physical and mental health of children. Given the important role that vaccination plays in reducing severe illness and mortality, it is essential for the efficient implementation of vaccination in the pediatric population. Nevertheless, parental distrust of vaccination, especially with regard to its safety and efficacy, hinders this process. Herein, we comprehensively summarize the available data on the safety and effectiveness of COVID-19 vaccine in children. The results show that the currently approved COVID-19 vaccine is safe and effective for children. Although two doses of vaccine in children seem insufficient to prevent Omicron infection, the booster dose provides enhanced protection against infection and severe illness. Most importantly, the bivalent vaccine has been approved for use in the pediatric population to extend the immune response to currently circulating Omicron variant. And the immune protection afforded to newborns after maternal vaccination appears to last only 6 months. Therefore, in the current situation where the rate of virus mutation is accelerating and the COVID-19 pandemic is still severe, it is crucial to extend vaccine protection to children over 6 months of age to weave a tighter safety net.
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Affiliation(s)
- Jingzhi Wen
- Department of Paediatrics, Yantai Yeda Hospital, Yantai, Shandong, 264006, China
| | - Xiaoan Du
- Jining Medical University, Jining, Shandong, 272067, China
| | - Adan Li
- Jining Medical University, Jining, Shandong, 272067, China
| | - Shungeng Zhang
- Jining Medical University, Jining, Shandong, 272067, China
| | - Shengyun Shen
- Jining Medical University, Jining, Shandong, 272067, China
| | - Ziteng Zhang
- Jining Medical University, Jining, Shandong, 272067, China
| | - Liyuan Yang
- Jining Medical University, Jining, Shandong, 272067, China
| | - Changqing Sun
- Department of Paediatrics, Yantai Yeda Hospital, Yantai, Shandong, 264006, China
| | - Jianing Li
- Department of Paediatrics, Yantai Yeda Hospital, Yantai, Shandong, 264006, China.
| | - Shiheng Zhu
- Cheeloo College of Medicine, Shandong University, Jinan, 250012, China.
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9
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Fashina TA, Miller CM, Paintsil E, Niccolai LM, Brandt C, Oliveira CR. Computable Clinical Phenotyping of Postacute Sequelae of COVID-19 in Pediatrics Using Real-World Data. J Pediatric Infect Dis Soc 2023; 12:113-116. [PMID: 36548966 PMCID: PMC9969330 DOI: 10.1093/jpids/piac132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Accepted: 12/09/2022] [Indexed: 12/24/2022]
Abstract
Many questions remain unanswered concerning the long-term effects of COVID-19 on children. In this report, we describe a computable phenotyping algorithm for identifying children and adolescents with postacute sequelae of COVID-19 (PASC) and pilot this tool to characterize the clinical epidemiology of pediatric PASC in a large healthcare delivery network.
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Affiliation(s)
| | - Christine M Miller
- Department of Pediatrics, Section of Infectious Diseases and Global Health, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Elijah Paintsil
- Department of Pediatrics, Section of Infectious Diseases and Global Health, Yale University School of Medicine, New Haven, Connecticut, USA
- Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA
- Department of Epidemiology of Microbial Diseases, Yale University School of Public, New Haven, Connecticut, USA
| | - Linda M Niccolai
- Department of Epidemiology of Microbial Diseases, Yale University School of Public, New Haven, Connecticut, USA
| | - Cynthia Brandt
- Department of Biostatistics, Section of Health Informatics, Yale University School of Public Health, New Haven, Connecticut, USA, USA
| | - Carlos R Oliveira
- Department of Pediatrics, Section of Infectious Diseases and Global Health, Yale University School of Medicine, New Haven, Connecticut, USA
- Department of Biostatistics, Section of Health Informatics, Yale University School of Public Health, New Haven, Connecticut, USA, USA
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10
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Beijnen EMS, Odumade OA, Haren SDV. Molecular Determinants of the Early Life Immune Response to COVID-19 Infection and Immunization. Vaccines (Basel) 2023; 11:vaccines11030509. [PMID: 36992093 DOI: 10.3390/vaccines11030509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 02/11/2023] [Accepted: 02/18/2023] [Indexed: 02/25/2023] Open
Abstract
Clinical manifestations from primary COVID infection in children are generally less severe as compared to adults, and severe pediatric cases occur predominantly in children with underlying medical conditions. However, despite the lower incidence of disease severity, the burden of COVID-19 in children is not negligible. Throughout the course of the pandemic, the case incidence in children has substantially increased, with estimated cumulative rates of SARS-CoV-2 infection and COVID-19 symptomatic illness in children comparable to those in adults. Vaccination is a key approach to enhance immunogenicity and protection against SARS-CoV-2. Although the immune system of children is functionally distinct from that of other age groups, vaccine development specific for the pediatric population has mostly been limited to dose-titration of formulations that were developed primarily for adults. In this review, we summarize the literature pertaining to age-specific differences in COVID-19 pathogenesis and clinical manifestation. In addition, we review molecular distinctions in how the early life immune system responds to infection and vaccination. Finally, we discuss recent advances in development of pediatric COVID-19 vaccines and provide future directions for basic and translational research in this area.
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Affiliation(s)
- Elisabeth M S Beijnen
- Precision Vaccines Program, Division of Infectious Diseases, Boston Children's Hospital, Boston, MA 02115, USA
- Harvard Medical School, Boston, MA 02115, USA
| | - Oludare A Odumade
- Precision Vaccines Program, Division of Infectious Diseases, Boston Children's Hospital, Boston, MA 02115, USA
- Harvard Medical School, Boston, MA 02115, USA
- Department of Pediatrics, Division of Medicine Critical Care, Boston Children's Hospital, Boston, MA 02115, USA
| | - Simon D van Haren
- Precision Vaccines Program, Division of Infectious Diseases, Boston Children's Hospital, Boston, MA 02115, USA
- Harvard Medical School, Boston, MA 02115, USA
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11
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Habet V, Oliveira CR. Clinical Epidemiology of Pediatric Coronavirus Disease 2019 and its Postacute Sequelae. Semin Respir Crit Care Med 2023; 44:66-74. [PMID: 36646086 PMCID: PMC9926930 DOI: 10.1055/s-0042-1759566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The coronavirus disease 2019 (COVID-19) pandemic has affected individuals of all ages across. Although children generally experience a benign illness from COVID-19, the emergence of novel variants of the virus has resulted in significant changes in the morbidity and mortality rates for this age group. Currently, COVID-19 is the eighth leading cause of pediatric deaths in the United States. In addition to acute respiratory illness, some children can develop a severe postinfectious condition known as a multisystem inflammatory syndrome in children, which can progress to rapid-onset cardiogenic shock. Recovery from COVID-19 can also be slow for some children, resulting in persistent or reoccurring symptoms for months, commonly referred to as long COVID. These postinfectious sequelae are often distressing for children and their parents, can negatively impact the quality of life, and impose a considerable burden on the health care system. In this article, we review the clinical epidemiology of pediatric COVID-19 and outline the management considerations for its acute and postacute manifestations.
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Affiliation(s)
- Victoria Habet
- Section of Critical Care, Department of Pediatrics, Yale University School of Medicine, New Haven, Connecticut
| | - Carlos R. Oliveira
- Section of Infectious Diseases and Global Health, Department of Pediatrics, Yale University School of Medicine, New Haven, Connecticut
- Section of Health Informatics, Department of Biostatistics, Yale University School of Public Health, New Haven, Connecticut
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12
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Hookham L, Lee HC, Patel DA, Coelho M, Giglio N, Le Doare K, Pannaraj PS. Vaccinating Children against SARS-CoV-2: A Literature Review and Survey of International Experts to Assess Safety, Efficacy and Perceptions of Vaccine Use in Children. Vaccines (Basel) 2022; 11:78. [PMID: 36679923 PMCID: PMC9862079 DOI: 10.3390/vaccines11010078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Revised: 12/16/2022] [Accepted: 12/16/2022] [Indexed: 12/31/2022] Open
Abstract
Introduction: The balance of risks and benefits of COVID-19 vaccination in children is more complex than in adults with limited paediatric data resulting in no global consensus on whether all healthy children should be vaccinated. We sought to assess the safety, efficacy, and effectiveness of childhood vaccination against SARS-CoV-2, as well as better understanding perceptions of vaccination in parents and vaccine experts. Methods: We performed a literature review for COVID-19 vaccine safety, efficacy, effectiveness, and perceptions. We searched international safety databases for safety data and developed an electronic survey to elicit country-specific COVID-19 immunisation data, including vaccine regulations, policies, rates, and public attitudes solicited from vaccine experts. Results: Nine studies were included in the final safety analysis. Local reactions were frequently reported across all studies and vaccine types. Adverse events reported to surveillance systems tended to be non-serious, and commonly included injection site reactions and dizziness. Twenty-three studies reported immunogenicity, efficacy, and effectiveness data. There were nine randomised control trials of six different vaccine types, which showed seroconversion of neutralising antibodies in vaccinated children ranging from 88% to 100%. The vaccine efficacy for Pfizer and Moderna vaccines ranged from 88% to 100%. There were 118 survey responses representing 55 different countries. Reported vaccination rates ranged from <1% to 98%. Most respondents described “mixed opinions” regarding paediatric vaccination policies in their country. By region, a more positive public attitude towards vaccination correlated with higher vaccination rates. Discussion: In this mixed-methods review, we have found evidence that vaccination against COVID-19 in children is safe, efficacious, and effective. Overall, the combined evidence from both the literature review and survey highlights the need for further data on both the safety and effectiveness of COVID-19 vaccinations in children.
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Affiliation(s)
- Lauren Hookham
- Institute for Infection and Immunity, St. George’s University of London, London SW17 0RE, UK
| | - Hillary C. Lee
- Children’s Hospital Los Angeles, Los Angeles, CA 90027, USA
| | - Divya A. Patel
- Children’s Hospital Los Angeles, Los Angeles, CA 90027, USA
| | - Mariana Coelho
- Independent Researcher, Buenos Aires Ciudad 1425, Argentina
| | - Norberto Giglio
- Children’s Hospital Ricardo Gutiérrez, Buenos Aires Ciudad 1425, Argentina
| | - Kirsty Le Doare
- Institute for Infection and Immunity, St. George’s University of London, London SW17 0RE, UK
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13
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Abstract
While most children with coronavirus 2019 (COVID-19) experience mild illness, some are vulnerable to severe disease and develop long-term complications. Children with disabilities, those from lower-income homes, and those from racial and ethnic minority groups are more likely to be hospitalized and to have poor outcomes following an infection. For many of these same children, a wide range of social, economic, and environmental disadvantages have made it more difficult for them to access COVID-19 vaccines. Ensuring vaccine equity in children and decreasing health disparities promotes the common good and serves society as a whole. In this article, we discuss how the pandemic has exposed long-standing injustices in historically marginalized groups and provide a summary of the research describing the disparities associated with COVID-19 infection, severity, and vaccine uptake. Last, we outline several strategies for addressing some of the issues that can give rise to vaccine inequity in the pediatric population.
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Affiliation(s)
- Carlos R Oliveira
- Corresponding Author: Carlos R. Oliveira, M.D., Ph.D., 15 York Street, PO Box 208064, New Haven, CT 06520-8064, USA. E-mail:
| | - Kristen A Feemster
- Vaccine Education Center, The Children’s Hospital of Philadelphia, Philadelphia, PA, USA
- Department of Pediatrics, Division of Infectious Disease, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Erlinda R Ulloa
- Department of Pediatrics, University of California Irvine School of Medicine, Irvine, CA 92697, USA
- Division of Infectious Diseases, Children’s Health of Orange County, Orange, CA 92868, USA
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14
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Rudan I, Millington T, Antal K, Grange Z, Fenton L, Sullivan C, Buelo A, Wood R, Woolford L, Swann OV, Murray JL, Cullen LA, Moore E, Haider F, Almaghrabi F, McMenamin J, Agrawal U, Shah SA, Kerr S, Simpson CR, Katikireddi SV, Ritchie SLD, Robertson C, Sheikh SA. BNT162b2 COVID-19 vaccination uptake, safety, effectiveness and waning in children and young people aged 12-17 years in Scotland. THE LANCET REGIONAL HEALTH. EUROPE 2022; 23:100513. [PMID: 36189425 PMCID: PMC9514975 DOI: 10.1016/j.lanepe.2022.100513] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Background The two-dose BNT162b2 (Pfizer-BioNTech) vaccine has demonstrated high efficacy against COVID-19 disease in clinical trials of children and young people (CYP). Consequently, we investigated the uptake, safety, effectiveness and waning of the protective effect of the BNT162b2 against symptomatic COVID-19 in CYP aged 12-17 years in Scotland. Methods The analysis of the vaccine uptake was based on information from the Turas Vaccination Management Tool, inclusive of Mar 1, 2022. Vaccine safety was evaluated using national data on hospital admissions and General Practice (GP) consultations, through a self-controlled case series (SCCS) design, investigating 17 health outcomes of interest. Vaccine effectiveness (VE) against symptomatic COVID-19 disease for Delta and Omicron variants was estimated using a test-negative design (TND) and S-gene status in a prospective cohort study using the Scotland-wide Early Pandemic Evaluation and Enhanced Surveillance of COVID-19 (EAVE II) surveillance platform. The waning of the VE following each dose of BNT162b2 was assessed using a matching process followed by conditional logistic regression. Findings Between Aug 6, 2021 and Mar 1, 2022, 75.9% of the 112,609 CYP aged 16-17 years received the first and 49.0% the second COVID-19 vaccine dose. Among 237,681 CYP aged 12-15 years, the uptake was 64.5% and 37.2%, respectively. For 12-17-year-olds, BNT162b2 showed an excellent safety record, with no increase in hospital stays following vaccination for any of the 17 investigated health outcomes. In the 16-17-year-old group, VE against symptomatic COVID-19 during the Delta period was 64.2% (95% confidence interval [CI] 59.2-68.5) at 2-5 weeks after the first dose and 95.6% (77.0-99.1) at 2-5 weeks after the second dose. The respective VEs against symptomatic COVID-19 in the Omicron period were 22.8% (95% CI -6.4-44.0) and 65.5% (95% CI 56.0-73.0). In children aged 12-15 years, VE against symptomatic COVID-19 during the Delta period was 65.4% (95% CI 61.5-68.8) at 2-5 weeks after the first dose, with no observed cases at 2-5 weeks after the second dose. The corresponding VE against symptomatic COVID-19 during the Omicron period were 30.2% (95% CI 18.4-40.3) and 81.2% (95% CI 77.7-84.2). The waning of the protective effect against the symptomatic disease began after five weeks post-first and post-second dose. Interpretation During the study period, uptake of BNT162b2 in Scotland has covered more than two-thirds of CYP aged 12-17 years with the first dose and about 40% with the second dose. We found no increased likelihood of admission to hospital with a range of health outcomes in the period after vaccination. Vaccination with both doses was associated with a substantial reduction in the risk of COVID-19 symptomatic disease during both the Delta and Omicron periods, but this protection began to wane after five weeks. Funding UK Research and Innovation (Medical Research Council); Research and Innovation Industrial Strategy Challenge Fund; Chief Scientist's Office of the Scottish Government; Health Data Research UK; National Core Studies - Data and Connectivity.
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Affiliation(s)
- Igor Rudan
- Usher Institute, The University of Edinburgh, Edinburgh, UK
| | | | | | | | | | | | | | - Rachael Wood
- Usher Institute, The University of Edinburgh, Edinburgh, UK
- Public Health Scotland, Glasgow, UK
| | - Lana Woolford
- Usher Institute, The University of Edinburgh, Edinburgh, UK
| | - Olivia V. Swann
- Department of Child Life and Health, University of Edinburgh, Edinburgh, UK
- Royal Hospital for Sick Children, Paediatric Infectious Diseases, Edinburgh, UK
| | | | | | | | - Fasih Haider
- Usher Institute, The University of Edinburgh, Edinburgh, UK
| | | | | | - Utkarsh Agrawal
- School of Medicine, University of St Andrews, St Andrews, UK
| | | | - Steven Kerr
- Usher Institute, The University of Edinburgh, Edinburgh, UK
| | - Colin R. Simpson
- School of Health, Wellington Faculty of Health, Victoria University of Wellington, Wellington, New Zealand
| | | | | | - Chris Robertson
- Public Health Scotland, Glasgow, UK
- Department of Mathematics and Statistics, University of Strathclyde, Glasgow, UK
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15
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Sabu JM, Zahid I, Jacob N, Alele FO, Malau-Aduli BS. Effectiveness of the BNT162b2 (Pfizer-BioNTech) Vaccine in Children and Adolescents: A Systematic Review and Meta-Analysis. Vaccines (Basel) 2022; 10:1880. [PMID: 36366387 PMCID: PMC9698079 DOI: 10.3390/vaccines10111880] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 11/01/2022] [Accepted: 11/03/2022] [Indexed: 10/15/2023] Open
Abstract
Efforts to control the COVID-19 pandemic have expanded to the vaccination of children and adolescents. This systematic review assesses the utility of the BNT162b2 (Pfizer-BioNTech) vaccine in children and adolescents aged 5-18 years, considering its effectiveness against COVID infection, hospital and intensive care admission and duration of effectiveness after vaccination. Six databases were searched following the PRISMA guidelines. Pooled estimates and 95% confidence intervals (CIs) were calculated using meta-analysis. Fifteen studies were included in the systematic review, while 12 studies were included in the meta-analysis. Evidence suggests that the two-dose vaccination regime provided high effectiveness of 92% (95% CI, 86-96) against COVID infection. Vaccination also conferred high protection against hospitalisation (91%) and intensive care admission (85%). The vaccine was highly protective against the Delta variant of the virus, but showed a lower protection against the Omicron variant. Most adverse effects were transient and mild, commonly including pain at the injection site, fatigue and headache. Current findings are suggestive of waning immunity over time; however, further research is needed to investigate the relevance of booster doses in this age group. In summary, the Pfizer-BioNTech BNT162b2 vaccine demonstrated high levels of protection against COVID-19 infection and its complications while maintaining an adequate safety profile in children and adolescents.
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Affiliation(s)
- Jewel Maria Sabu
- College of Medicine and Dentistry, James Cook University, Townsville, QLD 4811, Australia
| | - Izza Zahid
- College of Medicine and Dentistry, James Cook University, Townsville, QLD 4811, Australia
| | - Namitha Jacob
- College of Medicine and Dentistry, James Cook University, Townsville, QLD 4811, Australia
| | - Faith O. Alele
- College of Public Health, Medical & Veterinary Sciences, James Cook University, Townsville, QLD 4811, Australia
| | - Bunmi S. Malau-Aduli
- College of Medicine and Dentistry, James Cook University, Townsville, QLD 4811, Australia
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16
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Florentino PTV, Millington T, Cerqueira-Silva T, Robertson C, de Araújo Oliveira V, Júnior JBS, Alves FJO, Penna GO, Vital Katikireddi S, Boaventura VS, Werneck GL, Pearce N, McCowan C, Sullivan C, Agrawal U, Grange Z, Ritchie LD, Simpson CR, Sheikh A, Barreto ML, Rudan I, Barral-Netto M, Paixão ES. Vaccine effectiveness of two-dose BNT162b2 against symptomatic and severe COVID-19 among adolescents in Brazil and Scotland over time: a test-negative case-control study. THE LANCET. INFECTIOUS DISEASES 2022; 22:1577-1586. [PMID: 35952702 PMCID: PMC9359673 DOI: 10.1016/s1473-3099(22)00451-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 06/22/2022] [Accepted: 06/23/2022] [Indexed: 02/09/2023]
Abstract
BACKGROUND Little is known about vaccine effectiveness over time among adolescents, especially against the SARS-CoV-2 omicron (B.1.1.529) variant. This study assessed the associations between time since two-dose vaccination with BNT162b2 and the occurrence of symptomatic SARS-CoV-2 infection and severe COVID-19 among adolescents in Brazil and Scotland. METHODS We did test-negative, case-control studies in adolescents aged 12-17 years with COVID-19-related symptoms in Brazil and Scotland. We linked records of SARS-CoV-2 RT-PCR and antigen tests to national vaccination and clinical records. We excluded tests from individuals who did not have symptoms, were vaccinated before the start of the national vaccination programme, received vaccines other than BNT162b2 or a SARS-CoV-2 booster dose of any kind, or had an interval between their first and second dose of fewer than 21 days. Additionally, we excluded negative SARS-CoV-2 tests recorded within 14 days of a previous negative test, negative tests recorded within 7 days after a positive test, any test done within 90 days after a positive test, and tests with missing sex and location information. Cases (SARS-CoV-2 test-positive adolescents) and controls (test-negative adolescents) were drawn from a sample of individuals in whom tests were collected within 10 days of symptom onset. We estimated the adjusted odds ratio and vaccine effectiveness against symptomatic COVID-19 for both countries and against severe COVID-19 (hospitalisation or death) for Brazil across fortnightly periods. FINDINGS We analysed 503 776 tests from 2 948 538 adolescents in Brazil between Sept 2, 2021, and April 19, 2022, and 127 168 tests from 404 673 adolescents in Scotland between Aug 6, 2021, and April 19, 2022. Vaccine effectiveness peaked at 14-27 days after the second dose in both countries during both waves, and was significantly lower against symptomatic infection during the omicron-dominant period in Brazil (64·7% [95% CI 63·0-66·3]) and in Scotland (82·6% [80·6-84·5]), than it was in the delta-dominant period (80·7% [95% CI 77·8-83·3] in Brazil and 92·8% [85·7-96·4] in Scotland). Vaccine efficacy started to decline from 27 days after the second dose for both countries, reducing to 5·9% (95% CI 2·2-9·4) in Brazil and 50·6% (42·7-57·4) in Scotland at 98 days or more during the omicron-dominant period. In Brazil, protection against severe disease remained above 80% from 28 days after the second dose and was 82·7% (95% CI 68·8-90·4) at 98 days or more after receiving the second dose. INTERPRETATION We found waning vaccine protection of BNT162b2 against symptomatic COVID-19 infection among adolescents in Brazil and Scotland from 27 days after the second dose. However, protection against severe COVID-19 outcomes remained high at 98 days or more after the second dose in the omicron-dominant period. Booster doses for adolescents need to be considered. FUNDING UK Research and Innovation (Medical Research Council), Scottish Government, Health Data Research UK BREATHE Hub, Fiocruz, Fazer o Bem Faz Bem programme, Brazilian National Research Council, and Wellcome Trust. TRANSLATION For the Portuguese translation of the abstract see Supplementary Materials section.
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Affiliation(s)
- Pilar T V Florentino
- Centre of Data and Knowledge Integration for Health (CIDACS), Gonçalo Moniz Institute, Oswaldo Cruz Foundation, Salvador, Brazil; Biomedical Science Institute, University of São Paulo, São Paulo, Brazil.
| | | | - Thiago Cerqueira-Silva
- LIB and LEITV Laboratories, Instituto Gonçalo Moniz, Oswaldo Cruz Foundation, Salvador, Brazil; Faculty of Medicine, Federal University of Bahia, Salvador, Brazil
| | | | - Vinicius de Araújo Oliveira
- Centre of Data and Knowledge Integration for Health (CIDACS), Gonçalo Moniz Institute, Oswaldo Cruz Foundation, Salvador, Brazil
| | - Juracy B S Júnior
- Institute of Collective Health, Federal University of Bahia, Salvador, Brazil
| | - Flávia J O Alves
- Centre of Data and Knowledge Integration for Health (CIDACS), Gonçalo Moniz Institute, Oswaldo Cruz Foundation, Salvador, Brazil
| | - Gerson O Penna
- Tropical Medicine Centre, University of Brasília, Fiocruz School of Government Brasília, Brasília, Brazil
| | | | - Viviane S Boaventura
- LIB and LEITV Laboratories, Instituto Gonçalo Moniz, Oswaldo Cruz Foundation, Salvador, Brazil; Faculty of Medicine, Federal University of Bahia, Salvador, Brazil
| | - Guilherme L Werneck
- Department of Epidemiology, Social Medicine Institute, State University of Rio de Janeiro, Rio de Janeiro, Brazil; Institute of Collective Health Studies, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Neil Pearce
- Faculty of Epidemiology and Population Health, London School of Hygiene & Tropical Medicine, London, UK
| | - Colin McCowan
- School of Medicine, University of St Andrews, St Andrews, Scotland, UK
| | | | - Utkarsh Agrawal
- School of Medicine, University of St Andrews, St Andrews, Scotland, UK
| | - Zoe Grange
- Public Health Scotland, Glasgow, Scotland, UK
| | - Lewis D Ritchie
- Academic Primary Care, University of Aberdeen, Aberdeen, Scotland, UK
| | - Colin R Simpson
- School of Health, Wellington Faculty of Health, Victoria University of Wellington, Wellington, New Zealand
| | - Aziz Sheikh
- Usher Institute, University of Edinburgh, Edinburgh, UK
| | - Mauricio L Barreto
- Centre of Data and Knowledge Integration for Health (CIDACS), Gonçalo Moniz Institute, Oswaldo Cruz Foundation, Salvador, Brazil
| | - Igor Rudan
- Usher Institute, University of Edinburgh, Edinburgh, UK
| | - Manoel Barral-Netto
- Centre of Data and Knowledge Integration for Health (CIDACS), Gonçalo Moniz Institute, Oswaldo Cruz Foundation, Salvador, Brazil; LIB and LEITV Laboratories, Instituto Gonçalo Moniz, Oswaldo Cruz Foundation, Salvador, Brazil
| | - Enny S Paixão
- Faculty of Epidemiology and Population Health, London School of Hygiene & Tropical Medicine, London, UK
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17
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Oliveira CR, Shapiro ED, Weinberger DM. Bayesian Model Averaging to Account for Model Uncertainty in Estimates of a Vaccine's Effectiveness. Clin Epidemiol 2022; 14:1167-1175. [PMID: 36281232 PMCID: PMC9587703 DOI: 10.2147/clep.s378039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Accepted: 09/28/2022] [Indexed: 02/05/2023] Open
Abstract
Purpose Vaccine effectiveness (VE) studies are often conducted after the introduction of new vaccines to ensure they provide protection in real-world settings. Control of confounding is often needed during the analyses, which is most efficiently done through multivariable modeling. When many confounders are being considered, it can be challenging to know which variables need to be included in the final model. We propose an intuitive Bayesian model averaging (BMA) framework for this task. Patients and Methods Data were used from a matched case-control study that aimed to assess the effectiveness of the Lyme vaccine post-licensure. Cases were residents of Connecticut, 15-70 years of age with confirmed Lyme disease. Up to 2 healthy controls were matched to each case subject by age. All participants were interviewed, and medical records were reviewed to ascertain immunization history and evaluate potential confounders. BMA was used to systematically search for potential models and calculate the weighted average VE estimate from the top subset of models. The performance of BMA was compared to three traditional single-best-model-selection methods: two-stage selection, stepwise elimination, and the leaps and bounds algorithm. Results The analysis included 358 cases and 554 matched controls. VE ranged between 56% and 73% and 95% confidence intervals crossed zero in <5% of all candidate models. Averaging across the top 15 models, the BMA VE was 69% (95% CI: 18-88%). The two-stage, stepwise, and leaps and bounds algorithm yielded VE of 71% (95% CI: 21-90%), 73% (95% CI: 26-90%), and 74% (95% CI: 27-91%), respectively. Conclusion This paper highlights how the BMA framework can be used to generate transparent and robust estimates of VE. The BMA-derived VE and confidence intervals were similar to those estimated using traditional methods. However, by incorporating model uncertainty into the parameter estimation, BMA can lend additional rigor and credibility to a well-designed study.
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Affiliation(s)
- Carlos R Oliveira
- Department of Pediatrics, Yale University School of Medicine, New Haven, CT, USA,Department of Biostatistics, Yale University School of Public Health, New Haven, CT, USA,Correspondence: Carlos R Oliveira, Yale University School of Medicine, 464 Congress Avenue, Suite 204, New Haven, CT, 06520, USA, Tel +1 203 785 5474, Email
| | - Eugene D Shapiro
- Department of Pediatrics, Yale University School of Medicine, New Haven, CT, USA,Department of Epidemiology of Microbial Diseases, Yale University School of Public Health, New Haven, CT, USA
| | - Daniel M Weinberger
- Department of Epidemiology of Microbial Diseases, Yale University School of Public Health, New Haven, CT, USA
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18
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Affiliation(s)
- Sophie E Katz
- Department of Pediatrics, Division of Infectious Diseases, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Kathryn Edwards
- Department of Pediatrics, Division of Infectious Diseases, Vanderbilt University Medical Center, Nashville, Tennessee
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19
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Zeng B, Gao L, Zhou Q, Yu K, Sun F. Effectiveness of COVID-19 vaccines against SARS-CoV-2 variants of concern: a systematic review and meta-analysis. BMC Med 2022; 20:200. [PMID: 35606843 PMCID: PMC9126103 DOI: 10.1186/s12916-022-02397-y] [Citation(s) in RCA: 141] [Impact Index Per Article: 70.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Accepted: 05/09/2022] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND It was urgent and necessary to synthesize the evidence for vaccine effectiveness (VE) against SARS-CoV-2 variants of concern (VOC). We conducted a systematic review and meta-analysis to provide a comprehensive overview of the effectiveness profile of COVID-19 vaccines against VOC. METHODS Published randomized controlled trials (RCTs), cohort studies, and case-control studies that evaluated the VE against VOC (Alpha, Beta, Gamma, Delta, or Omicron) were searched until 4 March 2022. Pooled estimates and 95% confidence intervals (CIs) were calculated using random-effects meta-analysis. VE was defined as (1-estimate). RESULTS Eleven RCTs (161,388 participants), 20 cohort studies (52,782,321 participants), and 26 case-control studies (2,584,732 cases) were included. Eleven COVID-19 vaccines (mRNA-1273, BNT162b2, ChAdOx1, Ad26.COV2.S, NVX-CoV2373, BBV152, CoronaVac, BBIBP-CorV, SCB-2019, CVnCoV, and HB02) were included in this analysis. Full vaccination was effective against Alpha, Beta, Gamma, Delta, and Omicron variants, with VE of 88.0% (95% CI, 83.0-91.5), 73.0% (95% CI, 64.3-79.5), 63.0% (95% CI, 47.9-73.7), 77.8% (95% CI, 72.7-82.0), and 55.9% (95% CI, 40.9-67.0), respectively. Booster vaccination was more effective against Delta and Omicron variants, with VE of 95.5% (95% CI, 94.2-96.5) and 80.8% (95% CI, 58.6-91.1), respectively. mRNA vaccines (mRNA-1273/BNT162b2) seemed to have higher VE against VOC over others; significant interactions (pinteraction < 0.10) were observed between VE and vaccine type (mRNA vaccines vs. not mRNA vaccines). CONCLUSIONS Full vaccination of COVID-19 vaccines is highly effective against Alpha variant, and moderate effective against Beta, Gamma, and Delta variants. Booster vaccination is more effective against Delta and Omicron variants. mRNA vaccines seem to have higher VE against Alpha, Beta, Gamma, and Delta variants over others.
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Affiliation(s)
- Baoqi Zeng
- Department of Science and Education, Peking University Binhai Hospital, Tianjin, China
| | - Le Gao
- Department of Pharmacology and Pharmacy, The University of Hong Kong, Hong Kong, China
| | - Qingxin Zhou
- Tianjin Centers for Disease Control and Prevention, Tianjin, China
| | - Kai Yu
- Department of Science and Education, Peking University Binhai Hospital, Tianjin, China.
| | - Feng Sun
- Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Centre, Beijing, China.
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