Al-Razi (Rhazes) & Infectious Disease Differentiation: Smallpox vs. Measles, Medicinal Ethanol, and Medical Skepticism

The Skeptical Chief Physician of Baghdad

Born in the Persian city of Rey (near modern Tehran) in 865 CE, Abu Bakr Muhammad ibn Zakariya al-Razi (known in Europe as Rhazes) served as the chief physician of the royal hospital in Baghdad. A pioneer of empirical laboratory chemistry and clinical medicine, Al-Razi introduced a fearless spirit of scientific skepticism.

1. Differentiating Smallpox from Measles (Al-Judari wa al-Hasbah)

Before Al-Razi, ancient physicians conflated smallpox (Variola) and measles (Morbilli) as minor variations of the same febrile disorder. Al-Razi published the first precise clinical differential diagnosis in medical history:

• Documented that smallpox presents with severe lower back pain, persistent vomiting, and deep pustular skin eruptions.


• Clarified that measles presents with prominent ocular conjunctival tearing, continuous coughing, and non-pustular erythematous macules.

2. Chemical Distillation & "Doubts About Galen"

• Medicinal Ethanol: Al-Razi perfected alembic fractional distillation techniques, producing purified ethyl alcohol for antiseptic wound cleaning.
• Shukuk \'ala Jalinus (Doubts About Galen): Openly challenged Galen’s unchecked authority, demonstrating that observed clinical empirical facts must always override ancient theoretical dogmas.

3. References & Historical Citations

• Greenhill, W. A. (1848). A Treatise on the Small-pox and Measles by Abu Becr Mohammed ibn Zacariya ar-Razi. Sydenham Society, London.
• Al-Razi. Kitab al-Hawi fi al-Tibb (The Comprehensive Book of Medicine). Dairatu\'l-Ma\'arif al-Osmania.

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