This document gives an overview of the actions taken by PAHO/WHO in response to the Haitian earthquake. It covers those immediate actions that were staged through the Office of the PAHO/WHO Representative in the Dominican Republic relating to hospital care and improving the capacity of health centers on the border between Haiti and the Dominican Republic. It also addresses activities in the areas of risk communication, rehabilitation, mental health, biosecurity, water and sanitation, and epidemiologic surveillance. The document examines coordination issues at the government level, among United Nations agencies and civil society. It is available in Spanish at www.paho.org/dor.