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.
Protection against invasive disease due to Hib was 90 to 98.2 percent depending on the study. 7 MenHibrix efficacy for Hib is evaluated by antibody levels of PRP measured in the blood and compared to similar vaccines containing H. influenza type b and then compared to other Hib-containing vaccines.