In late 1910, a lethal respiratory epidemic spread along transport and trading routes in northeast China. It was primary pneumonic plague, capable of passing directly between people at close range. More than 60,000 deaths are commonly associated with the epidemic.
Identifying a different kind of plague
Wu Lien-teh arrived in Harbin in December 1910. Pathological and bacteriological investigation supported the conclusion that the lungs were central to the disease and that close respiratory contact, rather than only rat fleas, explained the rapid winter spread.
That distinction shaped the response. Authorities isolated patients and contacts, strengthened railway controls, restricted movement, organized hospitals and adopted protective masks. The handling and cremation of bodies was controversial but aimed to reduce exposure in frozen conditions where burial was difficult.
A regional and international response
The epidemic unfolded in a politically contested region connected by rail to Russia and other parts of northeast Asia. Cooperation and rivalry crossed borders. In 1911, specialists from multiple countries met at the International Plague Conference in Mukden, with Wu playing a leading role.
The response helped establish lasting institutions, including the North Manchurian Plague Prevention Service. Wu later contributed to national quarantine and public-health systems.
What the history can and cannot prove
The epidemic demonstrates the value of identifying the transmission route, protecting health workers, sharing observations and coordinating across jurisdictions. It should not be reduced to a claim that one intervention alone ended the outbreak. Multiple measures, changing contact patterns and sustained administration worked together.