H. Influenzae Type B (Hib) is a type of bacteria that can cause serious infections, particularly in young children. It is known for leading to illnesses such as meningitis, pneumonia, and epiglottitis. Before the introduction of the Hib vaccine, these infections were common and could be life-threatening. The Hib vaccine has significantly reduced the incidence of infections caused by H. Influenzae Type B. Vaccination is typically given to infants and young children, providing them with immunity against this bacterium. As a result, the number of severe cases has decreased dramatically in countries with widespread vaccination programs.