Which of the following is used to increase antigenicity of vaccine ?
**Core Concept**
Adjuvants are substances added to vaccines to enhance the body's immune response, thereby increasing the vaccine's effectiveness. This is particularly useful for vaccines that may not induce a strong immune response on their own.
**Why the Correct Answer is Right**
The correct answer, **Aluminum salts**, is a type of adjuvant commonly used in vaccines. Aluminum salts, such as aluminum phosphate or aluminum hydroxide, work by activating the immune system's dendritic cells, which then present the vaccine antigens to T-cells, leading to a stronger immune response. This is achieved through the activation of toll-like receptors (TLRs) on the surface of dendritic cells.
**Why Each Wrong Option is Incorrect**
**Option A:** **Squalene** is an oil-based adjuvant used in some vaccines, such as the influenza vaccine. However, it is not the most commonly used adjuvant in vaccines.
**Option B:** **Cholera toxin** is a bacterial toxin used as an adjuvant in some vaccines, such as the oral poliovirus vaccine. However, it is not used to increase antigenicity of vaccines in general.
**Option C:** **Gelatin** is a component of some vaccines, used as a stabilizer or emulsifier. However, it is not an adjuvant designed to increase antigenicity.
**Clinical Pearl / High-Yield Fact**
When administering vaccines, it's essential to note that some individuals may experience adverse reactions to certain adjuvants, such as aluminum salts. This is particularly relevant for patients with a history of allergies or sensitivities.
**Correct Answer:** C.