Naegleria fowleri protozoan. Coloured transmission electron micrograph (TEM) of a section through a Naegleria fowleri protozoan. The nucleus (purple) contains a large nucleolus (orange), in which ribonucleic acid is synthesised. This organism is an opportunistic pathogen of humans, causing meningoencephalitis (inflammation of the brain and its surrounding membranes) when inhaled, often by children swimming in fresh water. Headaches, vomiting, sensory disturbance and a fatal coma may occur if the victim is not treated, often with a combination of antibiotics and anti-fungal drugs. Magnification: x3300 at 6x7cm size.

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