A Deadly Parasite's Return Threatens US Ranchers Too Young to Remember It

[dweller]

2. Article answers my questions

The screwworm, whose scientific name “cochliomyia hominivorax” means “man eater,” is actually a fly. It lays its eggs on the wounds as well as noses, eyes, udders and umbilical cord stumps of living mammals. It mostly feeds on animals, but can infect and kill human beings, taking root in abrasions as small as tick bites.
The eggs hatch into larvae, which burrow or “screw” deep into the host’s flesh. “The larvae eat around and down until there is a hole inside the animal the size of your fist,” said Rick Tate, a lifelong rancher from Marfa, Texas. After three to five days, the larva pupates into a fly and begins to reproduce, starting the cycle anew.

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