An infectious agent that can be found in untreated swimming pools or in rivers, ponds, and streams that have been contaminated is

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Giardia intestinalis is a protozoan that is commonly found in untreated swimming pools or in rivers, ponds, and streams that have been contaminated with fecal material from infected animals or humans. Aspergillus is a mold that is commonly found in damp indoor environments and can cause respiratory problems. Norovirus is a highly contagious virus that is often associated with outbreaks of gastrointestinal illness in crowded spaces. Salmonella is a bacteria that is often associated with contaminated food sources. While Salmonella could potentially be found in contaminated water sources, it is less commonly associated with swimming pool or natural water contamination than Giardia.

An Infectious Agent That Can Be Found in Untreated Swimming