A significant proportion of the world's population is infected with parasitic helminths (worms). These are catogorised into three groups: nematodes (roundworms), cestodes (tapeworms) and trematodes (flukes). It is estimated that over 800 million people have trichiuriasis (whipworm) and over 1 billion people have ascariasis (roundworm).
Endemic helminthic diseases in the UK:
A common characteristic of helminthic diseases is the complex lifecycle with adults, embryos and larvae living in different environments. Life cycles vary from three weeks to three months.
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