Bacteria. Coloured scanning electron micrograph (SEM) of bacteria (green, yellow, blue, red) on a household sponge. The bacteria include Staphylococcus sp. and Pseudomonas sp. , both of which are significant human pathogens. A damp sponge can provide a breeding ground for bacteria contained in remnants of food or soap. Magnification: x1888 at 6x6cm size.
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