Haemophilus influenza

Haemophilus influenzae, commonly referred to as H flu, is a family of bacteria that causes a variety of infections. Most serious H flu infections are caused by type b strains. Before Haemophilus influenzae type b (Hib) vaccine was introduced in 1988, about 20,000 children in the United States under 5 years old developed severe Hib disease annually. Fortunately, Hib disease has decreased by > 99 percent in countries where Hib vaccine is used.