A highly hidden infection of the Delta variant that was only discovered after the eighth nucleic acid testing shows the variant's characteristics of high infectivity, high concealment and untypical initial symptoms, demands multiple rounds of nucleic acid testing to stop virus transmission in no time, a government official concluded after disclosing the details of the case confirmed in Zhengzhou, Central China's Henan Province on Saturday.
Zhengzhou reported two confirmed local cases on Saturday including the one who tested negative in seven nucleic acid testing and only tested positive on the eighth time.
The patient is a doctor from The Sixth People's Hospital of Zhengzhou which has been under centralized closed management since July 31 after clustered hospital-acquired infection broke out at the designated hospital for COVID-19 patients, according to Li Huifang, deputy secretary general of the People's Government of Zhengzhou city.
The patient tested positive on August 6 and was confirmed as a local infection on August 7.
