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In a Phase one trial, a normal volunteer tests the safety of a potential vaccine. This process has been completed at a record speed. However, it will still take a few months to confirm its initial safety. The next step is a Phase two trial, involving hundreds or even thousands of people, which will take an additional 6 to 8 months to determine if the vaccine is effective. Overall, it will take around a year to a year and a half to know if the vaccine can be used. Another important aspect is ensuring that the vaccine does not worsen the infection. This can only be determined through extended studies involving individuals at risk. Previous cases have shown that vaccines that initially appeared safe actually made the situation worse. Therefore, caution is necessary before administering the vaccine.