Swine Flu pandemic in 2009 was caused due to which strain: September 2010
**Core Concept**
The Swine Flu pandemic in 2009 was a global outbreak caused by a novel strain of the influenza A virus, specifically H1N1pdm09. This strain was a result of the reassortment of genetic material from different influenza viruses, including human, swine, and avian strains.
**Why the Correct Answer is Right**
The H1N1pdm09 strain was a triple-reassortant virus, meaning it contained genetic material from three different sources. It had the surface proteins of the H1N1 swine influenza virus, the hemagglutinin (HA) protein, and the matrix protein 2 (M2) from the human influenza virus, and the non-structural protein 1 (NS1) from the avian influenza virus. This unique combination of genetic material allowed the virus to spread rapidly among humans, resulting in a global pandemic.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the correct strain of the virus.
**Option B:** This option is incorrect because it is not a recognized strain of the influenza virus.
**Option C:** This option is incorrect because it is not associated with the 2009 Swine Flu pandemic.
**Clinical Pearl / High-Yield Fact**
The 2009 Swine Flu pandemic highlights the importance of monitoring and surveillance for emerging influenza strains, as well as the need for rapid development and distribution of vaccines to prevent and control outbreaks.
**Correct Answer:** A. H1N1pdm09.