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Nasal vaccine: A futuristic intervention in immunisation drive
Russia 'Sputnik V' vaccine promises to help people develop immunity against COVID-19 for two years: Here's all you need to know
Russia's Sputnik V: Germany, India, US, even fellow Russians skeptical of COVID-19 vaccine
Putin announces first 'registered' COVID-19 vaccine from Russia's Gamaleya Institute; his daughter among those inoculated
