The scale of the outbreak in Manaus, Brazil, has attracted the interest of epidemiologists around the world. What made the city so vulnerable? With an infection rate of 2445 per 100,000 it is one of the worst hit cities in the world. A resurgence is feared.

Marie Amorim. The frail 79 -year-old has spent 13 days in the Delphina Aziz hospital, having travelled five hours along the Amazon in a speed boat.

ìLots of people at home got sick,î her daughter Jael says, perched beside the large bed. ìBut not everyone came to hospital.î