In Beijing, the vaccinated qualify for buy-one-get-one-free ice cream cones. In northern Gansu Province, a county government published a 20-stanza poem extolling the virtues of the jab. In the southern town of Wancheng, officials warned parents that if they refused to get vaccinated, their children’s schooling and future employment and housing were all at risk. China is deploying a medley of tactics, some tantalizing and some threatening, to achieve mass vaccination on a staggering scale: a goal of 560 million people, or 40 percent of its population, by the end of June.

China has already proven how effectively it can mobilize against the coronavirus. And other countries have achieved widespread vaccination, albeit in much smaller populations. But China faces a number of challenges. The country’s near-total control over the coronavirus has left many residents feeling little urgency to get vaccinated. Some are wary of China’s history of vaccine-related scandals, a fear that the lack of transparency around Chinese coronavirus vaccines has done little to assuage. Then there is the sheer size of the population to be inoculated.