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Positive chemotaxis is movement toward the source of the chemical stimulus (along the chemical concentration gradient in air or water); negative chemotaxis is movement away from the source. The phenomenon is known to exist in a number of microorganisms and invertebrates.
1 Be aware that testing for Salmonella spp. in food using the cultural method in the BAM (or similarly validated method) can yield one of three results: 2  A presumptive positive result, which is a preliminary result that may or may not ultimately yield a confirmed positive result (i.e., it may yield a negative result).