Authorities reported 328 symptomatic infections in July - almost equal to the total number of local cases from February to June.
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More than 260 infections nationwide have been linked to a cluster in Nanjing city in eastern Jiangsu province, where nine cabin cleaners at an international airport tested positive on July 20. Hundreds of thousands have already been locked down in the province, while Nanjing has tested all 9.2 million residents twice.
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After one asymptomatic case was discovered in Zhengzhou - the epicentre of recent deadly floods in central Henan province - city officials on Saturday ordered mass testing of all 10 million residents. The head of the city health commission was also sacked.
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"The COVID vaccine's protection against the Delta variant may have somewhat declined, but the current vaccine still has a good preventative and protective effect against the Delta variant," said Feng Zijian, virologist at the Chinese Center for Disease Control and Prevention.