The name coupon arose because in the past, paper bond certificates were issued which had coupons attached to them, one for each interest payment. On the due dates the bondholder would hand in the coupon to a bank in exchange for the interest payment.
Hib vaccine. Haemophilus influenzae type B vaccine is a vaccine used to prevent Haemophilus influenzae type b (Hib) infection. In countries that include it as a routine vaccine, rates of severe Hib infections have decreased more than 90%. It has therefore resulted in a decrease in the rate of meningitis, pneumonia, and epiglottitis.
Hib, or Haemophilus influenzae type b, can also cause serious joint and skin infections as well as other less common infections. Before the Hib vaccine was approved for young children in the late 1980s, Hib was the leading cause of bacterial meningitis in U.S. children under 5. About 20,000 children in the United States, most of them under 5 years old, contracted Hib meningitis each year.