Randomized, Immunogenicity, Safety, study, heterologous, homologous, COVID-19, booster, vaccination, two dose, three dose, third, second, Coronavac, Sinovac, SARS-CoV-2, schedule, coronavirus, pandemic, Oxford, Brazil, Ministry of Health, protection
Capacity building, Clinical trial, Clinical trial site, COVID-19, Latin America, Vaccine trial.
Pertussis, Tetanus-diphtheria-acellular pertussis vaccine, Healthcare professionals vaccination.