A medical worker sitting on a mobile nucleic acid sampling tricycle takes a swab sample from a resident for COVID-19 nucleic acid test on October 31, 2022 in Zhengzhou, China. Liu Xu/VCG via Getty Images Beijing — Access to an industrial zone in the central Chinese city of Zhengzhou was suspended Wednesday after the city reported dozens of coronavirus cases and workers who assemble Apple Inc. iPhones left their factory in the zone following outbreaks. The announcement didn't say whether the isolation of the Zhengzhou Airport Economic Zone was related to cases at the Foxconn factory. It gave no indication…