A 58-year-old Greek woman has set a grim record: the first documented case of Oestrus ovis, the sheep bot fly, completing near-full development inside a human nose, progressing all the way to pupa and puparium formation before she sneezed the remnants out.
The standard assumption in parasitology held that O. ovis larvae deposited in human nasal passages stall at the first larval stage and die. A handful of cases in recent decades pushed that boundary to second- and third-stage larvae. This case, published in the CDC's Emerging Infectious Diseases journal by a medical entomologist and colleagues, shatters it entirely. The woman's deviated septum appears to have created the physical conditions that allowed development to continue where it normally cannot.
The full paper is worth reading for the mechanistic argument: why this specific anatomical abnormality may have mimicked a sheep's nasal environment closely enough to sustain larval progression. If a structural quirk in one patient changes the developmental outcome this dramatically, the prior assumption that humans are dead-end hosts for this parasite needs revisiting.
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