The WHO Rapid Pandemic Assessment Collaboration, Fraser, Christophe, Donnelly, Christl A., Cauchemez, Simon, Hanage, William P., Van Kerkhove, Maria D., Hollingsworth, T. Déirdre, Griffin, Jamie, Baggaley, Rebecca F., Jenkins, Helen E., Lyons, Emily J., Jombart, Thibaut, Hinsley, Wes R., Grassly, Nicholas C., Balloux, Francois, Ghani, Azra C., Ferguson, Neil M., Rambaut, Andrew, Pybus, Oliver G., Lopez-Gatell, Hugo, Alpuche-Aranda, Celia M., Chapela, Ietza Bojorquez, Zavala, Ethel Palacios, Guevara, Dulce Ma. Espejo, Checchi, Francesco, Garcia, Erika, Hugonnet, Stephane, and Roth, Cathy