Jaundice at presentation was less common (p = 0.037; Fishers exact test) and ALT levels were significantly lower in patients with imported leptospirosis compared to autochthonous infections (median 24, IQR 14–40 U/L versus median 76, IQR 30–292; p = 0.004; Mann Whitney U test). The gene discussed is GPT; the disease is infection.