Five fully vaccinated workers tested positive for COVID-19 at Shanghai international airport, China, the municipal government said on Saturday. It came as China’s top epidemiologist Zhong Nanshan said that the effectiveness of vaccines against the variant diminishes six months after the first dose. The city’s Pudong International Airport recorded two cases on Friday, including a Chinese national and an Ethiopian national, both in their 40s. Authorities soon sealed off the neighborhoods where the two lived. Local authorities then rolled out overnight testing in an attempt to halt the fresh outbreak, finding three more cases on Saturday. Some residents were woken at 3 a.m. to do nucleic acid testing, online posts show. The five are cargo workers at the city’s airport and follow the case of a nurse from a local hospital testing positive on Wednesday though also being fully vaccinated. All these cases came from priority groups for vaccination. The …
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