A security guard tests a deliveryman's temperature before allowing him to enter a residential community in Shanghai in February. YIN LIQIN/CHINA NEWS SERVICE

The Shanghai municipal government on June 16 reiterated its strict measures to quarantine visitors and returnees from the country's high- and medium-risk areas to minimize the spread of COVID-19.

According to Wu Jinglei, director of the Shanghai Municipal Health Commission, all those entering Shanghai from domestic high-risk areas will be required to undergo 14 days of quarantine at hotels and two nucleic acid tests.

Those from medium-risk areas within the country can choose to undergo a 14-day home quarantine if they have a residence in the city. This group of individuals must also undergo two nucleic acid tests.

"Such individuals must report to their local neighborhood committees and their employers or the hotels where they reside in within 12 hours after arrival in Shanghai," Wu said.

The National Health Commission updated on Tuesday that 40 new confirmed COVID-19 cases were reported in the Chinese mainland on Monday, of which 32 were domestically transmitted. Among these local cases, 27 were from Beijing, four in Hebei province and one in Sichuan province.

The number of confirmed COVID-19 cases in Beijing has reached 106 since June 11, when cases related to Xinfadi, a large wholesale food market in the capital, started to emerge.

Huaxiang town, where the market is located, is currently considered a high-risk area. Twenty-two subdistricts or towns in Beijing have been marked as medium-risk areas.