Cell-Fraction derived vaccine is –
**Core Concept**
Cell-Fraction derived vaccines are a type of vaccine that uses a component of a cell, such as a protein or a piece of genetic material, to stimulate an immune response. This approach is often used when the pathogen is difficult to grow in culture or when the desired antigen is not easily accessible.
**Why the Correct Answer is Right**
Cell-Fraction derived vaccines can be created by isolating specific components of a virus, such as the surface proteins or the nucleic acid. These components are then used to stimulate an immune response, providing protection against the virus without the need to grow the entire virus in culture. This approach is particularly useful for viruses such as influenza, where the virus is highly mutable and difficult to grow in culture.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe a characteristic of Cell-Fraction derived vaccines.
**Option B:** This option is incorrect because it refers to a different type of vaccine, such as a subunit vaccine, which uses a specific antigen rather than a cell fraction.
**Option C:** This option is incorrect because it is a type of vaccine that uses a live, attenuated virus, rather than a cell fraction.
**Clinical Pearl / High-Yield Fact**
Cell-Fraction derived vaccines are often used for viruses that are difficult to grow in culture, such as influenza and HIV. This approach allows for the creation of vaccines that are safe and effective, while minimizing the risk of vaccine-associated illness.
**Correct Answer:** C. Live attenuated vaccine