The purpose of this document is to provide guidance on how quarantine and isolation can be achieved if there is a suspected or confirmed case in an overcrowded setting. It will focus on informal settlements and collective shelters, but the guidance can be applied in non-refugee settings as well, such as detention centres and crowded neighborhoods. This guidance aims to support a coordinated and efficient response. It supports detailed planning at the regional level and is meant to be adapted to the local context. Households residing outside of these shelter types will be expected to follow the self-isolation circular provided by the MoPH. It is preferable, whenever feasible, that people are supported to remain in their homes. This guidance note will be continuously adapted as needed from the National level.