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How thousands in China got infected by brucellosis in one single outbreak

Usually caused by contact with animals, the outbreak in Lanzhou, was due to a leak at a vaccine plant.

The latest outbreak in Lanzhou was first uncovered in November 2019 when some students at the Lanzhou Veterinary Research Institute tested positive for brucellosis. By the end of December, at least 181 people at the institute had been infected. The government has tested 55,725 people in the city, of which 6,620 are positive for brucellosis as of now.