In 2010 after an earthquake had devastated the island of Haiti, the cholera bacillus appeared, perhaps associated with UN soldiers. It contaminated water sources, resulting in an outbreak that killed over 7,000 people. Cholera is still prevalent to this day returning after each rainy season.

Ludovic Dupuis, Ivan Gayton and Ruby Siddiqui from Médecins Sans Frontières (MSF) and Chris Grundy from LSHTM mapped and spatially analysed the outbreak in the hope of tracking how the outbreak was spreading. This animation shows the spread of the initial two waves of the outbreak.