The warm regions of the world are also the worm regions. In the rural villages and unsanitary overcrowded cities of the tropics, infection with the ‘big three’ (Ascaris, Trichuris & Hookworm) is so common that it Is accepted as a natural phenomenon.
Because these infections are rarely fatal, and their control seems such a formidable undertaking, relatively little effort has been made to free the world of its worm burden. This complacency is hardly warranted; the most common intestinal nematodes can cause considerable morbidity particularly when the host is already weakened by malnutrition and concurrent disease
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