person’s skin is curative or surgical removal by a trained doctor ( default.htm [accessed June 3, 2009]).

Evaporation: The conversion of liquid to gas.

Flocculation: The separation of a solution. Most commonly, flocculation is used to describe the removal of a sediment from a fluid. In addition to occurring naturally, flocculation can also be forced through agitation or the addition of flocculating agents. Numerous manufacturing industries use flocculation as part of their processing techniques, and it is also extensively employed in water treatment. The technique is also widely used in the medical world to analyze various fluids ( [accessed June 3, 2009]).

Fomite: Inanimate objects or substances that can transmit infectious organisms from one host to another (IOM. 1993. Indoor allergens: assessing and controlling adverse health effects. Washington, DC: National Academy Press).

Megacity: Urban concentration with more than 10 million inhabitants ( [accessed June 4, 2009]).

Recreational water: That which is used for water-based activities in marine, freshwater, hot tubs, spas and swimming pools (Pond, K. 2005. Water recreation and disease. plausibility of associated infections: acute effects, sequelae and mortality. London: IWA Publishing on behalf of the World Health Organization).

Sullage: Sullage (or grey water) is dirty water from the laundry, kitchen, and bathroom. Grey water contains chemicals such as dish detergent and soap as well as fats, grease, and whatever washes off our body while bathing. Sullage does not usually contain sewage but can be equally contaminated and can cause infections ( [accessed May 18, 2009]).

Superfund: The U.S. government program to clean up the nation’s uncontrolled hazardous waste sites.

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