over 2 years ago

The stringent refrigeration requirements for many of the first generation vaccines have also posed significant problems in reaching many of the world's poorest communities. For example, at present just 28% of India's population are fully vaccinated.

อ่านต่อเพิ่มเติม โรงเรียนบ้านรางม่วง

สาระสำคัญ  thermometer