COVID-19 vaccine effectiveness and variants in Nepal: study protocol for a test-negative case–control study with SARS-CoV-2 genetic sequencing por Andrew J Pollard, Grace Li, Sarah Kelly, Merryn Voysey, Sanjeev M Bijukchhe, Peter J O'Reilly, Katherine Theiss-Nyland, Meeru Gurung, Bhishma Pokhrel, Samita Acharya, Shreekrishna Maharjan, Ashis Shrestha, Bimal Pandey, Mipsang Lama, Ira Shrestha, Agnes Eordogh, Sonu Shrestha, Elaine Shuo Feng, Ganesh Shah, Shrijana Shrestha

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