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Disease Carriers

Bacteria: Haemophilus influenzae

H. influenzae is a gram-negative rod that causes meningitis and epiglottitis, occurring most frequently in children. Accounting strongly for the disease's virulence is the presence of a polysaccharide capsule, which enables the organism to resist host defenses. H. influenzae is further differentiated based on the type of capsule it has. H. influenzae serotype b was a leading cause of disease in infants and children until the mid-1980s, when a vaccine became available.

Haemophilus influenzae

Transmission electron micrographs of Haemophilus influenzae, negatively stained to enhance contrast.