One of Shanghai’s new locally transmitted COVID-19 cases has been confirmed to have been infected by the hyper-contagious Delta variant from overseas sources, health authorities said.
After genetic sequencing tests and analysis by the city’s disease control and prevention center, and confirmed by the national center, the virus is highly similar to a recent imported case.
That case was sent to the fever clinic at Songjiang District Central Hospital for investigation from designated quarantine places. The two cases share the same transmission chain, authorities said on Friday.
The infected patient, a 25-year-old woman, is a medical worker at Songjiang District Central Hospital. She hadn’t left Shanghai within 14 days before she was confirmed with COVID-19 infection on Wednesday.
She was infected because she was exposed to a person or an environment bearing the overseas virus due to her cursory prevention activity, the disease control and prevention center said.
She had no contact history with people from high- or medium-risk regions from other cities, and no travel history to those areas, according to the center.
Her 33 close contacts had received two rounds of nucleic acid tests by 11am on Friday. All tested negative and are now in quarantine at a designated location.