Several thousand people in Lanzhou city in China have tested positive for a bacterial disease called brucellosis. A leak in a biopharmaceutical company last year caused the outbreak of the disease. Health authorities have said that there has been no person-to-person transmission so far.
Brucellosis is a bacterial disease that mainly affects cattle, swine, goats, sheep and dogs. Humans can get infected if they come in direct contact with an infected animal.
Symptoms of the disease include fever, sweats, malaise, anorexia, headache and muscle pain. It can also leave men infertile. While these may subside, some symptoms could become chronic or never go away, like arthritis or swelling of certain organs, according to the United States Centers for Disease Control and Prevention (CDC).
Brucellosis also goes by the name of Malta fever or Mediterranean fever.