12th May 2024

A 38-year-old man presents with intermittent joint swelling and pain, particularly in his knees, over the past month.

A 38-year-old man presents with intermittent joint swelling and pain, particularly in his knees, over the past month. He also reports a history of a rash that appeared and resolved spontaneously a few weeks ago, described as a red expanding rash with a central clearing. He recalls a tick bite after camping in a forested area several months prior. Serological tests show antibodies against Borrelia burgdorferi.

Which is the most likely stage of this disorder?