Nelson - Ch. 194 H. influenza Flashcards
H influenza ? Gram staining ? shape
Gram neg, pleomorphic coccobacillus
Requirements of H influenza for growth
Factor X (hematin), Factor V (phosphopyridine nucleotide)
H influenzae ? capsule
Yes, serotyped in 6 distinct types designated a,b,c,d,e,f
T/F Humans are the only natural hosts of H. influenzae
T
T/F H influenza is part of the normal respiratory flora of healthy children
T, in 60-90% of healthy children
T/F Asymptomatic colonization with H influenzae type b occurs at a much lower rate in immunized populations
T
Socioeconomic factors for invasive G. influenzae type b disease
1) Childcare outside the home 2) Siblings of elementary school age or younger 3) Short duration of breastfeeding 4) Parental smoking
In Hib infection, history of ___ is associated with risk for invasive disease
Otitis media