In the context of vaccines manufactured to prevent COVID-19 pandemic, consider the following statements : 1. The Serum Institute of India produced COVID-19 vaccine named Covishield using mRNA platform. 2. Sputnik V vaccine is manufactured using vector based platform. 3. COVAXIN is an inactivated pathogen based vaccine. Which of the statements given above are correct?

Let's analyze each statement regarding COVID-19 vaccines: 1. **The Serum Institute of India produced COVID-19 vaccine named Covishield using mRNA platform:** Incorrect. Covishield, manufactured by the Serum Institute of India, is the AstraZeneca vaccine which uses a **viral vector platform** (specifically, a chimpanzee adenovirus vector), not an mRNA platform. mRNA vaccines (like Pfizer-BioNTech and Moderna) use messenger RNA to instruct cells to produce a harmless piece of the spike protein. 2. **Sputnik V vaccine is manufactured using vector based platform:** Correct. The Sputnik V vaccine, developed by Russia's Gamaleya Research Institute, uses two different human adenoviral vectors (Ad26 and Ad5) in a prime-boost approach. This is a classic viral vector platform. 3. **COVAXIN is an inactivated pathogen based vaccine:** Correct. COVAXIN, developed by Bharat Biotech in collaboration with ICMR-NIV, is an inactivated vaccine. This means it uses a whole, inactivated (killed) SARS-CoV-2 virus that cannot cause disease but can still trigger an immune response. Therefore, statements 2 and 3 are correct.