Chinanews, Changchun, Oct 23 – China has completed the first-stage clinical research work on its AIDS vaccine. The work, the first of such kind officially approved by the State Drug Administration, has now entered into the second-stage clinical trial period.During the second stage, the Changchun Baike Pharmaceutical Company, a medical body responsible for the research, will try to improve the immune intensity of the vaccine, based on the scientific findings it has made earlier. The pharmaceutical company will also try to include more diversified groups of people to take the vaccine as volunteers, so as to test the vaccine's immune antigenicity and make sure that the vaccine is safe to more people. Scientists will see how long the specific immune reaction will last. They will also try to solve the problems emerging during the first stage by adjusting the vaccine dosage and the vaccine-taking procedure, said a researcher at the Changchun Baike Pharmaceutical Company on Monday.In the 1990s, China kicked off the research work on AIDS vaccination. Many scientific bodies in China participated in the work. By 2006, Changchun Baike Pharmaceutical Company had made a breakthrough in its research work on AIDS vaccination. Later, the company successfully completed the first stage of its research work. From March 12, 2005 to June 11, 2006, 49 volunteers took the AIDS vaccine for the first-stage clinical test. Scientists later closely watched their reactions to the vaccine for 180 days. During the 180 days of observation period, scientists found that no volunteers had displayed any serious side effects from the vaccine. Scientists also found that vaccine takers could have specific cell immune response to the vaccine 15 days after they took it.The antigen gene for the AIDS vaccine produced by Changchun Baike Pharmaceutical Company was chosen from the AIDS virus strain commonly seen among Chinese people. So the vaccine is more applicable to the Chinese people. The completion of the first-stage clinical research work on the AIDS vaccine shows that China's research work in this field has reached advanced international level, experts at Changchun Baike said.