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Why do these worms not reproduce inside their host?

Helminths, or parasitic worms, cannot multiply in humans when mature. The adult parasite usually lives inside the host's intestinal lumen (the cavity through which digested food passes where nutrients are absorbed) and passes eggs into the lumen. Some parasite eggs require a period of maturation outside the host. Once they have matured outside the host, either the eggs themselves or the larvae are infective. Other parasite eggs don't require maturation outside a host, but will not hatch in the large intestine or outside the host. When they are ingested they hatch in the small intestine of the new host.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.