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ຄວາມສຳເລັດ ໃນໂຄງການສັກຢາວັກຊີນຂອງໂລກ ຊ່ວຍຊີວິດຫຼາຍລ້ານຄົນ


Vaccination programs against some of the world’s deadliest diseases have saved millions of lives over the past 20 years, according to researchers – but continuing progress is threatened by the COVID-19 pandemic, as Henry Ridgwell reports from London.

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