Natural disasters, to which many countries in the region of the Americas are prone, can seriously jeopardize progress made in the area of environmental health. Physical disruption of infrastructure and services is aggravated by the displacement of large sectors of the population. The consequent alteration in their daily environment has potentially hazardous health consequences. Too often it has been nececessary to spend scarce resources on emergency measures just to reestablish previously existing environmental health services. Shelter focus: Part II, Chapter 2, page 15: civil engineering structural damagePart II, Chapter 3, page 28: shelter