On a particularly warm autumn afternoon in Buenos Aires, Michelly Natalí Barreto Sánchez, 22, began to feel unwell. As she served customers at La Boca, the bar she had opened in Villa 31, one of the capital’s largest slums, she suddenly started to experience severe headaches and dizziness.
She told her customers, who are among the 70,000 people who live in this densely populated area close to the city centre, that she would have to close the bar, and she headed home.
