Usa Lek-UthaiMahidol University. Faculty of Public Health. Department of Parasitology and Entomology2022-07-122022-07-122021-07-122022Thai Journal of Public Health. Vol. 51, No. 3 (September - December 2021), 183-1872697-584X (Print)2697-5866 (Online)https://repository.li.mahidol.ac.th/handle/20.500.14594/72093engMahidol UniversitySARS-CoV-2Covid-19 vaccineEfficacyEffectivenessNatural immunityCOVID-19 Vaccines Help with Herd ImmunityArticleDepartment of Parasitology and Entomology Faculty of Public Health Mahidol University