Thousands of people in northwest China have tested positive for an infectious bacterial disease after a leak from a state-owned biopharmaceutical plant making animal vaccines. Health officials in Lanzhou, a city of 2.9 million, said 3,245 people had contracted brucellosis, a disease often caused by close contact with infected animals or animal products that can bring about fevers, joint pain and headaches. Another 1,401 people tested as an early positive ...