Sub-Antarctic Rodent Ecology — Andes Virus Null Corridor
concept
Detectives chased whether a rare deadly virus hitched a ride on a ship's rats — and proving it couldn't have is exactly what made the answer certain.
Who they are
The Sub-Antarctic Rodent Ecology node, examining whether the ship MV Hondius could have picked up Andes virus from rodents at its island stops.
What they do
The engine treats this as a ruled-out possibility that's valuable precisely because it's ruled out.
How it works
Per Report #84, the answer is definitively no: South Georgia eradicated its rats by 2018, and although Tristan da Cunha and Saint Helena have invasive rodents, Andes virus lives in only one host — the long-tailed pygmy rice rat, found only on the South American mainland — and the WHO confirmed no rats were on the ship itself.
Why it matters
The engine's point is that eliminating the ship-as-source theory locks the true origin firmly to pre-boarding exposure in Ushuaia, Argentina — a dead-end that clears away speculation.
The engine's record — word for word
Investigators initially considered whether the MV Hondius could have picked up the virus from rodents at any of its sub-Antarctic stops: South Georgia, Tristan da Cunha, Saint Helena, Ascension, Cabo Verde. **Report #84** ecological verdict: definitively no. South Georgia successfully eradicated rats by 2018. Tristan da Cunha and Saint Helena have invasive mouse and rat populations, but Andes virus is biologically restricted to one specific rodent host — the long-tailed pygmy rice rat (Oligoryzomys longicaudatus) — which exists only on the South American continent. The WHO confirmed there were no rats found on the ship itself either. This rules out the vessel-as-vector-habitat theory and locks the source firmly to pre-boarding exposure in Ushuaia, Argentina. The corridor is empirically a null — useful precisely because it eliminates speculative readings.
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