Biofilms in drinking water treatment plants and distribution systems are being viewed as potential reservoirs for frank and opportunistic pathogens. Organisms in biofilms are notoriously difficult to control with disinfection. Since detachment from biofilms often results in clumps of
organisms, these suspended bacteria may represent a greater infective dose via oral and inhaled modes of transmission. An overview of the types of organisms found in biofilms and conditions relating to the proliferation of biofilms in drinking water systems is given.
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