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The author explains that of the three main kinds of parasitic worms in Britain, the roundworm ---- .
Worms are intestinal parasites, but the only
common types found in Britain are . threadworms,
the tiny thread-like worms which cause irritability
and itching in the skin of children, less often in
adults. Then there are round-worms, ' somewhat
resembling the ordinary -garden earthworm, which
seldom lead to symptoms. Finally the third group
is the tapeworms which may reach a , length of 3
or even 6 m. Many parasitic worms lead a double
life, they spend part of their life in the human
intestine and the other part in the muscles of
another animal. The tapeworm, for example, while
in the human intestine, lays eggs which pass out
of the body in the excreta, and are then swallowed
by various animals, especially in those parts of the
world where human excreta are used as manure
in the fields.