The latest news is that Shanghai Health Cloud crashed (it crashed on the morning of March 16, and the problem has been fixed), and it actually crashed, and then the nucleic acid detection point could not do nucleic acid. Then decisively return to the place where you live. If you are not decisive, you risk being infected. According to media reports, the epidemic in Shanghai is because people who entered Hong Kong were isolated in a hotel that was ready to be renovated and opened for 36 years. Due to the imperfect ventilation system in the hotel, it is revealed that the newly discovered confirmed cases in Shanghai are highly similar to those in the hotel in epidemiology.