Coloured scanning electron micrograph (SEM) of Photocomposite of the three common types of bacterial morphology: coccus, bacillus, spirillum. Coccoid (spherical) bacteria include Streptococcus sp. and Staphylococcus sp., rods include Escherichia sp. and Bacillus sp., and spirals include Leptospira sp. and Spirillum sp.. Magnification: x800 when shortest axis printed at 25 millimetres.