"A sure remedy for worms!"
Gross Things About Hookworms:
When Ancylostoma duodenal larvae are “filariform” (in the non-feeding infectious stage), they travel through the lungs. Aaannd…well, you DO cough them up when they’re in there. Sometimes you cough them out of your system, sometimes you cough them into your mouth and swallow them. 
When you swallow the worms you cough up, they get back into the intestines, where they want to be. When you cough them onto the ground, they can immediately infect others. See, when one defecates the worms, the eggs get ejected from the body. Those then have to hatch, so that the A. duodenal can reach its filariform stage (which takes several days), and burrow into the skin of another host (or perhaps the same host!). When they’re coughed up at the stage that they need to be at to infect others, they can just dig right in to their new home…

"A sure remedy for worms!"

Gross Things About Hookworms:

When Ancylostoma duodenal larvae are “filariform” (in the non-feeding infectious stage), they travel through the lungs. Aaannd…well, you DO cough them up when they’re in there. Sometimes you cough them out of your system, sometimes you cough them into your mouth and swallow them.

When you swallow the worms you cough up, they get back into the intestines, where they want to be. When you cough them onto the ground, they can immediately infect others. See, when one defecates the worms, the eggs get ejected from the body. Those then have to hatch, so that the A. duodenal can reach its filariform stage (which takes several days), and burrow into the skin of another host (or perhaps the same host!). When they’re coughed up at the stage that they need to be at to infect others, they can just dig right in to their new home…

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    “A sure remedy for worms!”
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