China: large scale infection for 3,000 people with Brucella disease... How did it spread

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It has been confirmed that more than 3,000 people have been infected with Brucella disease, which is transmitted through cattle like cattle in Lanzhou, China. it became a mass infection because of the carelessness of a pharmaceutical company that makes a vaccine for Brucella disease.

At the end of November last year, four patients with Brucella disease suddenly occurred at a veterinary laboratory in Lanzhou, China. The number of confirmed cases rapidly increased in the research center and nearby areas, sanitation authorities conducted tests on more than 20,000 Lanzhou residents. As a result, so far 3,245 people have been diagnosed with Brucella disease.

Brucella disease, which is transmitted to humans through livestock such as cattle and sheep, has a mortality rate of 2% or less but if not treated, it can cause spondylitis and osteomyelitis. The outbreak occurred in July and August of last year when a plant in a pharmaceutical company in Lanzhou made an animal vaccine for Brucella disease and used an expired disinfectant. Wastes such as exhaust gases from the vaccine production process were not properly sterilized, and they spread outside with brucellosis.

Authorities canceled the factory's permit to produce a vaccine for Brucella disease in January.

Chinese media, Chai-Shin, raised suspicion of delayed response and reduction by authorities, saying that some patients with Brucella disease showed symptoms since September last year, but it took six months to be confirmed.