「Correlates of Protection」の版間の差分
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!Pneumococcus | !Pneumococcus | ||
| − | |Infection (bacteremia) is prevented by 0.20-0.35 µg/mL of serum antibodies | + | |Infection (bacteremia) is prevented by '''0.20-0.35 µg/mL''' of serum antibodies |
|Disease (pneumonia, otitis media, nasopharynx carriage) is prevented by '''>10 times higher''' serum antibodies | |Disease (pneumonia, otitis media, nasopharynx carriage) is prevented by '''>10 times higher''' serum antibodies | ||
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2022年10月22日 (土) 13:57時点における版
Correlates of Protection
| Correlates of Protection (CoP) | An immune response statistically correlated with protection |
|---|---|
| Mechanistic CoP (mCoP) | An immune response responsible for protection |
| Non-mechanistic CoP (nCoP) | An immune response surrogating mCoP and easily measured |
Identifying method of CoP (mCoP)
- Theoretically
- To measure immune responses at the time of exposure to the infection and compare them between those who get infection and not
- Practically
- To measure immune responses after the vaccination and compare them between those who get infection and not
- usually done in vaccine clinical trial phase 3
- To measure immune responses at the time of challenging exposure of vaccinated volunteers
- would be ethically approved only for milder and/or treatable infections such as seasonal influenza, cholera, dengue or cytomegalovirus
- To extrapolate vaccinated animal challenge model
- To extrapolate protective level of dosing of passive immunization (antibody treatment)
- To measure immune responses after the vaccination and compare them between those who get infection and not
Be careful
- "Immune reseponses" contain various kinds of immunological functions
- Serum antibodies with multiple isotypes and multiple functions
- Mucosal antibodies with multiple isotypes and multiple functions
- Helper T cells
- Killer T cells
- Regulatory T cells
- etc.
- Protection against infection is generally different from protection against disease
| Protection against infection | Protection against disease | |
|---|---|---|
| Polio | Infection is prevented by mucosal antibodies at nasopharynx and intestine (IgA + diffused IgG) | Disease (paralysis) is prevented by serum antibodies before entering CNS via blood |
| Pneumococcus | Infection (bacteremia) is prevented by 0.20-0.35 µg/mL of serum antibodies | Disease (pneumonia, otitis media, nasopharynx carriage) is prevented by >10 times higher serum antibodies |
