Salud y sistemas de salud
AstraZeneca's COVID-19 vaccine 90% effective, results show
Britain’s AstraZeneca said its vaccine for the novel coronavirus could be around 90% effective without any serious side effects.
Britain’s AstraZeneca said its vaccine for the novel coronavirus could be around 90% effective without any serious side effects.
Xiaozhangwan, China (Reuters) - As freezing winds whip across northern China this winter, Yao Guanghui is happy he’ll have one less chore to do: feeding the coal furnace that has long hea...