Adapted from HARVEY (2007)
The first emergency phase covers the immediate interventions and typically lasts from one to three months. They aim at providing basic facilities to contain and separate excreta, to prevent transmission of [7672-faecal-oral diseases] and the [7250-contamination] of water sources (see also [7694-sanitation in emergencies]). Emergency situations do not follow a linear progression: some situations may become more acute after improvements, e.g. when the affected population increases, an epidemic occurs, or the security deteriorates.