The coronavirus is hitting Latin America in ways unseen in the developed world. In Mexico, Covid-19 is savaging a health care system that was already inadequate. Doctors and nurses in Mexico say they lack masks and gloves. Hospitals are at 80% capacity in Mexico City. More than 20,000 health care workers have caught the virus. Nacha Cattan reports on what happens when a crisis hits a system that was unprepared, and underfunded, in the best of times.