Bacteria and viruses can live outside of the human body (such as on a countertop) sometimes for many hours or days. But parasites need a living host to survive.
Can parasites live outside a host?
Parasites that live outside the host are called ectoparasites (Figure 2A). For example, a flea is a parasite that lives on cats. In contrast, parasites that live inside their hosts are known as endoparasites (Figure 2B).
How long can parasitic worms live outside the body?
Pinworm eggs live up to 2 weeks outside the body on clothing, bedding, toys, toilet seats, or other objects and spread easily. Roundworm (Ascaris lumbricoides):
Can parasites live everywhere?
Human parasites are also ubiquitous. They're found everywhere and live in almost every major organ of the body -- including the eyes, brain, blood and, most commonly, the murky backwaters of the gastrointestinal system.
Can parasitic worms live on surfaces?
Yes. If you come into contact with infected poop of people or animals, you can get roundworms. You can also get them by touching infected surfaces, like soil.
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