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Look at the shape of these curves.

New York and Madrid had similar epidemics until they spectacularly diverged.

In March, both cities were caught by surprise and shut down because of #COVID19.

In September, the situation is under control in NY and alarming in Madrid.

Why? pic.twitter.com/VF0BCl0xyt

— Miguel Hernán (@_MiguelHernan) September 11, 2020