In a previously healthy 37‑year‑old man with a 4‑day history of rapidly progressive symmetric leg weakness after a gastroenteritis two weeks ago, flaccid paralysis, absent deep‑tendon reflexes in all limbs, flexor plantar responses, and cerebrospinal fluid showing markedly elevated protein with a normal cell count, what is the most likely diagnosis: transverse myelitis, botulism, herpes zoster radiculitis, acute intermittent phoria, or acute inflammatory demyelinating polyneuropathy (Guillain‑Barré syndrome)?

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