The Pfizer BioNTech, Moderna and Oxford/AstraZeneca vaccines have all been tested in animals as well as thousands of people, before they could be considered for licensing.
ວັກຊີນ Pfizer BioNTech, Moderna ແລະ Oxford / AstraZeneca ລ້ວນແຕ່ໄດ້ຮັບການທົດສອບຢູ່ໃນສັດພ້ອມກັບປະຊາຊົນຫລາຍພັນຄົນ, ກ່ອນທີ່ພວກເຂົາຈະໄດ້ຮັບການພິຈາລະນາຂໍອະນຸຍາດ.