Edmonston strain is –
**Core Concept**
The Edmonston strain is related to the measles vaccine, which is a live, attenuated vaccine. This strain is used in the production of the measles, mumps, and rubella (MMR) vaccine. The measles vaccine is crucial for preventing measles, a highly contagious viral disease.
**Why the Correct Answer is Right**
The Edmonston strain is indeed used in the measles vaccine, as it provides immunity against the measles virus. The vaccine works by inducing an immune response against the measles virus, thereby preventing the disease. The Edmonston strain is attenuated, meaning it has been weakened to reduce its virulence while still eliciting an immune response.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not specify the Edmonston strain.
**Option B:** This option is also incorrect as it does not relate to the measles vaccine.
**Option C:** This option is incorrect as the Edmonston strain is not associated with this option.
**Why Each Wrong Option is Incorrect (Continued)**
**Option D:** This option might seem plausible but is incorrect as the Edmonston strain specifically refers to the measles vaccine.
**Clinical Pearl / High-Yield Fact**
The measles vaccine, which includes the Edmonston strain, is typically administered in two doses, with the first dose given at 12-15 months of age and the second dose at 4-6 years of age. This vaccine is crucial for preventing measles outbreaks.
**Correct Answer:** D. Measles vaccine.