Haemophilus influenzae Disease (Including Hib)
Haemophilus influenzae disease is a name for any illness caused by bacteria called H. influenzae. Some of these illnesses, like ear infections, are mild while others, like bloodstream infections, are very serious. In spite of the name, H. influenzae does not cause influenza (the flu). Vaccines can prevent one type of H. influenzae (type b or Hib) disease.
Hib can cause severe infections of both the lining of the brain and spinal cord (meningitis) and the bloodstream. Vaccines can prevent Hib disease. CDC recommends routine Hib vaccination for all children younger than 2 years old.