Vaguely-similar symptoms: Hollinwell Incident <a href="https://www.bbc.com/news/uk-england-nottinghamshire-61551003" rel="nofollow">https://www.bbc.com/news/uk-england-nottinghamshire-61551003</a><p>The key, I think, would be to gather blood, tissue, air, soil, water, and food samples to rule out simpler environmental causes.