China study warns of 'colossal' Covid-19 outbreak if it opens up like US, France

China could face more than 630,000 Covid-19 infections a day if it dropped its zero-tolerance policies by lifting travel curbs, according to a study by Peking University mathematicians.

In the report published in China CDC Weekly by the Chinese Centre for Disease Control and Prevention, the mathematicians said China could not afford to lift travel restrictions without more efficient vaccinations or specific treatments.

Using data for August from the...