26th April 2024

A 50-year-old man, who works in a busy office environment, presents with a sudden onset of high fever, chills, severe muscle aches, and fatigue.

A 50-year-old man, who works in a busy office environment, presents with a sudden onset of high fever, chills, severe muscle aches, and fatigue. He mentions that several colleagues have been off sick with similar symptoms. He also complains of a dry cough and sore throat but no significant nasal congestion. 

On examination, his temperature is 39°C, pulse rate 102 bpm, and BP 130/80 mmHg. He appears fatigued and has diffuse muscle tenderness. Auscultation of the chest reveals normal breath sounds with no wheezing or crackles. His throat is mildly erythematous without exudate.

Which one of the following is the most likely diagnosis?