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Large rivers may be tainted with [[pesticide]] runoff and industrial pollutants from sources far upstream, but water in the backcountry, where people usually go for [[hiking]] or [[Backpacking (wilderness)|backpacking]], originates nearby and is free from these hazards. The most common danger is [[microbe|microbial]], and this may come from natural or human sources. | Large rivers may be tainted with [[pesticide]] runoff and industrial pollutants from sources far upstream, but water in the backcountry, where people usually go for [[hiking]] or [[Backpacking (wilderness)|backpacking]], originates nearby and is free from these hazards. The most common danger is [[microbe|microbial]], and this may come from natural or human sources. | ||
In most parts of the world, water may contain bacterial or protist contamination originating from human and animal waste, or sometimes from dead animals in or near the water. ''[[Giardia lamblia]]'' and ''Cryptosporidium spp.'', both of which cause | In most parts of the world, water may contain bacterial or protist contamination originating from human and animal waste, or sometimes from dead animals in or near the water. ''[[Giardia lamblia]]'' and ''Cryptosporidium spp.'', both of which cause diarrhea (see [[giardiasis]] and cryptosporidiosis), are common pathogens. Viruses may also be found in water, but are not common in developed countries.{{Fact|date=February 2007}} | ||
== Is giardiasis a threat in outdoor recreation? == | == Is giardiasis a threat in outdoor recreation? == |