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Target intelligence / Profile preview
Haemophilus influenzae type b Polysaccharide Antigen (Hib PRP)
- Target
- Hib PRP
- Molecular classification
- Polysaccharide, Antigen
01
Overview
The Haemophilus influenzae type b (Hib) polysaccharide antigen (PRP) is the main virulence factor of Hib bacteria. It is a polyribosylribitol phosphate capsule that enables the bacterium to evade host immune defenses, particularly phagocytosis and complement-mediated killing. PRP is the target of Hib conjugate vaccines, which elicit protective antibody responses in infants and young children.
- Other names
- PRPPolyribosylribitol phosphateHib capsular polysaccharide
02
Mechanism of action
Vaccine-induced antibody production against PRP, leading to opsonization and complement-mediated killing of Hib bacteria.
03
Biological functions
Evasion of phagocytosisEvasion of complement-mediated killingImmune evasionBacterial virulence
04
Disease associations
InfectionMeningitisSepsisEpiglottitisPneumoniaSeptic arthritisCellulitisOsteomyelitisPericarditisEndocarditis
05
Safety considerations
Hypersensitivity reactions to vaccine componentsLack of immunogenicity in some individuals (vaccine failure)Potential for interference with immune response to other vaccines
06
Interacting drugs
Hib conjugate vaccines (HbOC, PRP-OMP, PRP-T, PRP-D)
07
Biomarkers
Anti-PRP antibody titer (for vaccine efficacy)PRP concentration in biological samples (for diagnosis)
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