CARLYN IVERSON / SCIENCE PHOTO LIBRARY CARLYN IVERSON / SCIENCE PHOTO LIBRARY
Bacteria and other microbes. Illustration of bacteria, algae, protozoa, a fungus and a virus. The bacterium at far right may be Salmonella sp. , a cause of food poisoning. The other bacterium is at top centre. The protozoan at far left (brown) is Trypanosoma brucei, responsible for sleeping sickness in tropical Africa. At bottom right is another protozoan, possibly the dysentery- causing Entamoeba sp. At far left is a circular virus. There is a strand of colonial algae (green) at centre, while a one-celled alga is at bottom left. At lower centre is a fungus such as Aspergillus sp. , the cause of the lung infection aspergillo- sis. The.
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