I recall not too long ago seeing that they think they have identified the cause of the plague which swept Athens during the Peloponnesian War.
Despite the fact that Thucydides gave a very detailed description of the symptoms of that plague, it didn’t fit exactly any known disease. BTW, Thucydides would have known what he was talking about as he survived the plague.
I love references to Thucydides. I love his writings—read them in the Peloponese many years ago. What a beautiful mind.