Unlike some other countries  Brazil chose not to hold back supplies for second doses. Its vaccination campaign has mostly relied on CoronaVac shots, made locally using inputs from China"s Sinovac. But shipments of Chinese materials have lagged, just as millions are due for their second jab.
อ่านต่อเพิ่มเติม โรงเรียนวัดพ่วง
สาระน่ารู้ โรคลมพิษ