You've got the internal parasites, like Ascaris which is estimated to infect a quarter of all humans. It's the most common Helminthic infection. Then there are pinworms, the most common parasitic worm in the United States. As many as 50% of preschool children may have pinworms. Hookworms, tapeworms, lymphatic filariasis are also fairly common in humans. Dracunculiasis only affects about 16,000 each year but since it's the most horrifying parasitic worm I can think of, it gets a mention.
An ESTIMATE of 50% of PRESCHOOL CHILDREN (the highest percentage quoted) is a far cry from EVERYONE. The estimate of 25% of all humans infected with Ascaris is a figure I'm sure applies to the worldwide population, not to the American population. "Fairly common" is vague enough to be meaningless.
I do not want to turn this into a p*ssing contest, argument, or anything else. I only ask that each of us use common sense and a little research before we quote various things as gospel. I'm ending my part in this portion of the thread because I don't want to offend anyone. Let's just agree to disagree, shall we?

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