Pudong airport workers in protective clothing help arriving international passengers as they prepare to board buses to be taken to quarantine hotels in Shanghai on Aug. 13, 2021. Greg Baker/AFP
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.
