Due to the entirety of the Africa continent being on the brink of collapse, the World Health Organization spared no effort and permitted Chen Chen's clinical trial without a second thought. The requisite for splitting the trial into four phases was bypassed and the four phases were hence combined into a single-phase clinical trial.
The phases referred to here concerned the testing period for the vaccine. In usual settings, it was a requirement for the vaccine to go through four experimental phases before being debuted in the market.
The first phase of the trial was to examine the safety of the vaccine and the maximum number of candidates allowed was ten people. After the group was injected with the vaccine, they would be monitored for several months. The second phase of the trial would begin after ensuring that the vaccine did not pose any harm to the human body.