scientists developed a vaccine against Hemophilic influenza, type B (Hib) which is the foremost cause of meningitis that results in death or brain damage. Before, Hib was responsible for the death or brain damage of more than 800 children every year in the U.S. Earlier versions of vaccines were unsatisfactory and provided transitory immunity. However, a vaccine that was created and tested in rabbits and mice was verified to be a powerful immunogenic and is still used to date. Since its introduction to the medical field, Hib infections fell drastically by 70 %