Chinanews, Beijing, April 20 - It is estimated that the number of HIV-infected persons in Beijing should exceed some 12,000, and the epidemic has entered rapid-growth period.However, only 3,462 AIDS patients and HIV-infected persons are registered in Beijing, including 686 Beijingers, 2,634 non-locals and 142 foreigners. 1,357 of them got infected via sharing drug injectors, 924 through unprotected sex, 292 via blood transfusion, 243 via blood-taking, 46 from their mothers, and another 600 through unknown channels.