Mystery of the poisoned expedition

@article{Earl1994MysteryOT,
  title={Mystery of the poisoned expedition},
  author={John W. Earl and Barry V. McCleary},
  journal={Nature},
  year={1994},
  volume={368},
  pages={683-684}
}
The Burke and Wills expedition through the interior of Australia in the nineteenth century ended in calamity. But the cause of death was more pernicious than anyone at the time had imagined: beriberi due to thiaminase poisoning. 
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References

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The purification and properties of a thiaminase I enzyme from nardoo (Marsilea drummondii)
Abstract Fronds of the fern nardoo (Marsilea drummondii) contain a thiaminase I enzyme at very high levels of activity. Highest levels of enzyme activity were found in vigorously growing plantExpand