That research requires first that the vaccine be developed, then that it be studied for safety and effectiveness in animals, who are challenged with the virus after they are vaccinated, and then it must go into human studies.
U sklopu istraživanja, prije svega, cjepivo treba razviti, zatim proučiti i ispitati njegovu sigurnost i učinkovitost na životinjama koje se virusu izlažu nakon cijepljenja, a tek na kraju ispituje se na ljudima.