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Identification of an infestation of head lice (Pediculus humans capitis) can only be made by finding one or more live lice, usually whitish or grey-brown in colour, on a person’s head or scalp

Coloured scanning electron micrograph of the head and thorax of a human head louse (Pediculus humanus capitis) clinging to a strand of human hair

Source  Steve Gschmeissner / Science Photo Library