SHANGHAI (Reuters): Quanta Shanghai Manufacturing City would seem like an ideal site to implement China’s “closed-loop” management system to prevent the spread of COVID-19 that requires staff to live and work on-site in a secure bubble. Sprawled over land the size of 20 football fields, the campus houses factories, living quarters for 40,000 workers, some living 12 per room, and even a supermarket. But as COVID-19 breeched Quanta’s defenses, the system broke down into chaos on Thursday. Videos posted online showed more than a hundred Quanta workers physically overwhelming security guards in hazmat suits and vaulting over factory gates to…