Volunteers wait for citizens to register information at a stadium in Gulou District of Nanjing, capital of East China's Jiangsu province, July 25, 2021. (PHOTO / XINHUA)

China has tightened COVID-19 preventive measures at ports, airports, chess and poker rooms, and education and training facilities based on the latest developments of the pandemic, the National Health Commission said on Friday.

In a guideline released on its official website, the commission said that the number of facility types considered at higher risk of spreading the novel coronavirus has increased from 65 to 85.

The National Health Commission imposed tightened COVID-19 preventive measures on piers, ports, chess and poker rooms, tourism boats, theaters, entertainment and sports stadiums, milk tea shops, education and training centers, and temporary shelters

New additions include piers, ports, chess and poker rooms, tourism boats, theaters, entertainment and sports stadiums, milk tea shops, education and training centers, and temporary shelters.

Personnel categories deemed at higher risk of contracting the disease have also expanded to include cleaners, drivers, auxiliary police, dockers at airports, as well as market regulators on the front line, rescue personnel, volunteers, community workers and tourist guides.

The guideline stressed that staff members working on flights arriving from overseas or international airports should take stricter protection measures.

In a separate guideline released by the commission on the same day, it urged the public to wear masks not only indoors, but also at outdoor areas where people tend to gather, such as parks, outdoor squares and theaters.

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The guideline also suggested the public prepare at home some more protective masks, such as particulate respirators, which can be used when visiting hospitals.

The commission said that new mask-wearing rules have been rolled out to increase people's vigilance against the virus amid the domestic spread of the highly transmissible Delta variant.

The Ministry of Public Security said on Friday that China's public security organizations are also stepping up the investigation and punishment of actions that undermine the country's COVID-19 control and prevention efforts.

Enforcing the country's COVID-19 prevention measures, police departments across the country have recently handled more than 60 cases of COVID-19 prevention breaches and similar actions, said the ministry.

On August 11, police in Nanjing, east China's Jiangsu province, handled 11 cases of local residents leaving the city with other people's negative nucleic acid test results, in breach of the city's COVID-19 control protocols.

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The ministry urged the public to abide by COVID-19 prevention and control requirements. It vowed to handle breaches, the spread of pandemic-related rumors, and other similar behavior in strict accordance with the law.

With inputs from Xinhua