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.
: a vaccine containing bacterial capsular polysaccharide joined to a protein to enhance immunogenicity; especially : one that is used to immunize infants and children against invasive disease caused by Hib bacteria and that contains the Hib capsular polysaccharide polyribosylribitol phosphate bound to diphtheria or tetanus toxoid or to an outer ...