Immunogenicity and safety of CoronaVac vaccine in children and adolescents (Immunita-002, Brazil): A phase IV six-month follow up

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Corsini, Camila Amormino ; da Silva Martins, Priscila Fernanda ; Filgueiras, Priscilla Soares ; Lourenco, Adelina Junia ; de Souza Lima, Ana Esther ; Gomes, Sarah Vieira Contin ; de Jesus Jeremias, Wander ; Alves, Pedro Augusto ; da Rocha Fernandes, Gabriel ; Castro, Luciana Lisboa Mota e ; Teixeira-Carvalho, Andrea ; Azevedo, Ana Carolina Campi ; De Almeida Leitao Curimbaba, Caroline ; Lorencini, Daniela Aparecida ; Junior, Eolo Morandi ; da Silva, Victor Mattos ; Cervi, Maria Celia ; de Carvalho Borges, Marcos ; Nogueira, Mauricio Lacerda ; Campos, Guilherme Rodrigues Fernandes ; Correa, Paulo Roberto Lopes ; Carvalho, Taciana Malheiros Lima ; dos Reis, Jordana Grazziela Alves Coelho ; de Sousa Reis, Erik Vinicius ; dos Reis Castilho, Leda ; de Lima, Poliana Remundini ; do Nascimento, Joao Paulo Resende ; de Oliveira, Jaquelline Germano ; Filho, Olindo Assis Martins ; de Andrade, Livia Paulucci Cavalcanti ; Camargos, Isabela ; de Oliveira, Erica Louback ; Almeida, Ana Clara ; de Miranda, Daniel Alvim Pena ; Amorim, Raquel ; Pedretii, Camila Bedran ; de Souza Silva, Thais Barbara ; Otta, Dayane Andriotti ; dos Santos, Viviane Cristina Fernandes ; Ribeiro, agata L. ; Andrade, Luis Adan F. ; de Fatima S. Moraes, Thais ; Lima, Tulio M. ; de Abreu, Daniel P. B. ; Alvim, Renata G. F. ; Grenfell, Rafaella Fortini Queiroz e

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 15, n. 1, p. 16-pg., 2025-07-02.

Resumo

Vaccines are essential for the prevention and control of several diseases, and monitoring the immune response generated by vaccines is crucial. The immune response generated by vaccination against SARS-CoV-2 in children and adolescents is not well defined in terms of the intensity and medium to long-term duration of protective immunity, which may indicate the need for booster doses and could support decisions in public health. The study aims to evaluate the immunogenicity and safety of an inactivated SARS-CoV-2 vaccine (CoronaVac) in a two-dose primary protocol in children and adolescents aged 3 to 17 years old in Brazil. Participants were invited to the research at two public healthcare centers located in Serrana (S & atilde;o Paulo) and Belo Horizonte (Minas Gerais), Brazil. They underwent medical interviews to gather their medical history, including COVID-19 history and medical records. Physical exams were conducted, which included measurements of weight, blood pressure, temperature, and pulse rate. Blood samples were obtained from the participants before vaccination, 1 month after the first dose, and at 1, 3, and 6 months after the second dose. These samples were followed up using a virtual platform to monitor post-vaccination reactions and symptoms of COVID-19. The SARS-CoV-2 genome from swab samples of COVID-19 positive individuals was sequenced using NGS. Total antibodies were measured by ELISA, and neutralizing antibodies to the B.1 lineage and Omicron variant (BA.1) were quantified by PRNT and VNT assays. The cellular immune response was evaluated by flow cytometry through the quantification of systemic soluble immune mediators. The follow-up of 640 participants showed that CoronaVac was able to significantly induce the production of total IgG antibodies to SARS-CoV-2 and the production of neutralizing antibodies to the B.1 lineage and Omicron variant. Additionally, a robust cellular immune response was observed, characterized by a wide release of pro-inflammatory and regulatory mediators in the early post-immunization moments. Adverse events recorded so far have been mild and transient, except for seven serious adverse events reported on VigiMed. The results indicate a robust and sustained immune response induced by CoronaVac in children and adolescents for up to six months, providing evidence to support the safety and immunogenicity of this effective immunizer. (AU)

• Processo FAPESP: 22/03645-1 - Estudo da interação vírus-vetor e dos mecanismos envolvidos na modulação da dinâmica de transmissão viral
• Beneficiário: Maurício Lacerda Nogueira
• Modalidade de apoio: Auxílio à Pesquisa - Temático