Causes of Acute Onset Fever - Differential Diagnosis Algorithm

Viral:

 • Rhinovirus

 • Influenza Virus

 • Parainfluenza Virus

 • Adenovirus

 • Enterovirus

 • Coronavirus

 • HIV

Infectious - Other:

 • Fungal

 • Protozoa (eg.malaria)

 • Other parasites

Bacteremia:

 • Intermittent Bacteremia

 • Continuous Bacteremia

Septic Shock

Acute Organ Specific Infection:

• Upper Respiratory Tract Infection

 • Urinary Tract Infection

 • Pneumonia

 • Pyelonephritis

 • Meningitis

 • Skin Infection

Abscess:

 • Head and neck

 • Thoracic

 • Abdominal

 • Pelvic

 • Extremity

Inflammatory:

 • Thrombophlebitis

 • DVT

 • Pancreatitis

Iatrogenic:

 • Transfusion reaction

 • Malignant Hyperthermia

 • Neuroleptic malignant syndrome

Endocrine:

 • Thyroid storm

 • Acute Adrenal Insufficiency

Non-Infectious Other:

 • Heat stroke

 • Sickle Cell disease

 • Drug fever



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