A 26-year-old male presents with sudden onset fever, cold intolerance, headache, and myalgia for 3 days after harvesting rice. Physical exam: temperature 38.6°C, conjunctival congestion, heart rate 90/min, clear lungs. Initially treated as 'upper respiratory infection' but symptoms persisted. Laboratory tests: WBC 21.6×10<sup>9</sup>/L (neutrophils 90%), seroagglutination test titer 1:400. Diagnosed with leptospirosis. What is the clinical type in this case?