The poxvirus vaccine is aimed to ______ [originaltext] Chinese scientists admin

Chinese scientists administered an experimental AIDS vaccine on Saturday, to some volunteers. The vaccinations launched the second phase of clinical testing for AIDS DNA vaccine.
  The AIDS vaccine consists of two gene vaccines, one containing DNA of the AIDS virus and the other carting poxvirus.
  The AIDS DNA vaccine is aimed at helping the body’s antibodies and cells to form immunity to HIV, the AIDS virus, and the poxvirus vaccine is aimed at strengthening the immunity, the developers said.
  The safety of the two gene vaccines was tested in the first phase of trials. The second phase is to examine their combined safety, which means vaccinating volunteers twice with each vaccine.