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.
Haemophilus influenzae type b (Hib) is one of six related types of bacterium. In 2000, H.influenzae type B (Hib) was estimated to have caused two to three million cases of serious disease, notably pneumonia and meningitis, and 450 000 deaths in young children.