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Cities, counties and districts with no newly confirmed cases in the last 14 days are categorized as low-risk regions, those with less than 50 cases or those with over 50 but without cluster outbreak are classified as mid-risk regions and those with over 50 cases as well as cluster outbreak are classified as high-risk regions.

"Discharged patients who retest positive are required to be quarantined at designated hospitals for medical observation since they might be infectious," said Wang Guiqiang, an infectious disease expert with the Peking University First Hospital, at a press conference.

Noting that now Kazakhstan is witnessing a spread of the contagious illness, Xi said China highly appreciates the fact that under Tokayev's leadership, Kazakhstan has taken swift and decisive measures, which demonstrates a responsible attitude towards all the people.

The two countries also issued a joint statement on deepening the China-Pakistan all-weather strategic cooperative partnership.

BEIJING, April 25 (Xinhua) -- An array of hygiene-promoting activities have been carried out nationwide in April, China's 32nd Patriotic Public Health Month, to create a sound environment for the COVID-19 epidemic prevention and control in the country.