Dr. Ezekiel Emmanuel of the University of Pennsylvania gives this early warning on the risks of the sudden U turn in China's zero covid policy to complete reopening. He says the switch from zero covid to population wide immunity via viral spread is coming on too suddenly without preparation. He says China made three mistakes. First, the economic cost of zero covid that dropped growth and created high youth unemployment of over 20%. Second, not procuring Pfizer and Moderna mRNA vaccines with newer technologies. Third, moving to abruptly end the zero covid policy 180 degrees in a sudden move that lacks preparation. Precipitiously ending the zero covid policy for 800 million people means rapid spread says Dr. Emmanuel. He says the key variable the R statistic that measures how many people get infected from one covid patient on average, has moved from 2 to 3 during the early stages of the pandemic to 10 with the omicron variant. Chinese officials report the R to be at 16 in China today, says Dr. Emmanuel. ...