In China’s campaign to get its population of 1.4 billion vaccinated against COVID-19, the magic number is 77.6 percent. Government agencies all over the country, from Inner Mongolia to Jiangsu, uniformly pledge to get this exact percentage of their populations vaccinated. A rural township in Harbin boasts that it’s fully vaccinated 11,025 of its population of 14,198, 0.05 percentage point above the sacred target of 77.6 percent. So, just what is the significance of 77.6?