China will stick with its “dynamic” zero-tolerance Covid-19 policy over the winter and spring amid uncertainty over the effectiveness of vaccines against the new Omicron variant, according to a senior health official.George Gao Fu, director of the Chinese Centre for Disease Control and Prevention, said vaccines continued to prevent severe disease, hospitalisation and death, but there were uncertainties.“Omicron has the ability to evade immunity, like Beta [a previously identified variant],…
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