Effectiveness of BNT162b2 and CoronaVac vaccines against omicron in children aged 5 to 11 years.

"Declarations Conflict of interestThe authors declare that they have no competing interests. No financial or non-financial benefits have been received or will be received from any party related directly or indirectly to the subject of this article. Author RH Mak is a member of the Editorial Board for Word Journal of Pediatrics. The paper was handled by the other Editor and has undergone rigorous peer review process. Author RH Mak was not involved in the journal's review of, or decisions related to this manuscript. Ethical approvalWe accessed data in SIVEP-Gripe. All data on this database are publicly available and are anonymous. Data collection and analysis for this investigation were carried out under ethically agreed principles on open data in Brazil, for which ethics review is exempted. Conflict of interest The authors declare that they have no competing interests. No financial or non-financial benefits have been received or will be received from any party related directly or indirectly to the subject of this article. Author RH Mak is a member of the Editorial Board for Word Journal of Pediatrics. The paper was handled by the other Editor and has undergone rigorous peer review process. Author RH Mak was not involved in the journal's review of, or decisions related to this manuscript."

"Funding This study was supported by the CNPq (National Council for Scientific and Technological Development) and FAPEMIG (Research Support Foundation of Minas Gerais)."