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Parasites

 

hookworm

Parasites such as roundworms, hookworms, flukes and tapeworms – which can grow as long as 9.75 m (32 ft) – can live inside our bodies. They may cause such diseases as elephantiasis, in which the patient’s limbs swell to gigantic sizes. Head lice live on human heads and feed on blood. The lice lay little white eggs, called nits, which cling to individual hairs.

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