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TOPSHOT - A woman helps a patient at Tongren hospital in Shanghai on January 3, 2023. - A senior doctor at Shanghai's Ruijin Hospital has said 70 percent of the megacity's population may have been infected with Covid-19 during China's huge surge in cases, state media reported on January 3. (Photo by Hector RETAMAL / AFP) (KEYSTONE/AFP/HECTOR RETAMAL)