China developed early smallpox inoculation with detailed records
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Researchers in China examined historical texts to understand the development of smallpox inoculation practices within the country.
As early as 1465 to 1572, during the Ming Dynasty, people in China were practicing inoculation, deliberately inducing mild smallpox infections to provide future protection. Medical texts from the Ming and Qing dynasties detail methods for selecting inoculation material, techniques for administering it, and ways to reduce risks through repeated transmission, all aligning with traditional Chinese understandings of disease.
Ancient Chinese doctors observed that people who recovered from smallpox gained lasting immunity. They developed inoculation methods based on this knowledge, combining it with existing theories about “time-qi” (external pathogenic factors) and “fetal toxicity” (inherent human vulnerabilities). They believed introducing a mild case of smallpox could expel the “fetal toxicity” and prevent severe illness from natural infection. Early methods included using clothing or bedding from smallpox patients to induce mild infections.
This evolved into techniques like applying pus from mature blisters to a nostril, and then using dried crusts from smallpox sores, either powdered and blown into the nose (dry method) or mixed with water (wet method). Practitioners carefully selected donors with mild cases to minimize risks. They also found that passing the inoculation material through multiple people lessened the severity of reactions, a process similar to modern virus attenuation.
While the origins of inoculation are debated, the detailed Chinese records, dating back to at least the 16th century, demonstrate a uniquely developed and well-documented system integrated with traditional Chinese medicine.
