MEXICO CITY—Washington Post 31 March 2020—The U.S.-Mexico border has long been a region of contrasts. But people in both countries are puzzling over the latest one: The number of confirmed cases of the coronavirus on the Mexican side is just a small fraction of the U.S. count.

On Sunday, confirmed cases in California topped 6,200, compared with just 23 in Baja California. Arizona had 919 cases, dwarfing the 14 in neighboring Sonora. New Mexico reported 237 cases; in Chihuahua state, there were six.

The U.S.-Mexico border is the busiest in the world, with an estimated 1 million legal crossings per day. The neighbors’ economies are intertwined.

So why is there such a big difference in cases?

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