Among Haemophilus influenzae strains, group designations (e.g., type b) are based on:
a. flagellar antigens.
b. capsular characteristics.
c. cell wall antigens.
d. infectious capabilities.
B
Among H. influenzae strains, two broad categories exist: typeable and nontypeable. Strains are typed on the basis of capsular characteristics. The capsule is made up of a sugar-alcohol phos-phate (e.g., polyribitol phosphate) complex. Differences in this complex are the basis for sepa-rating encapsulated strains into one of six groups: type a, b, c, d, e, or f.
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A codon consists of three consecutive
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