@WHO: How is a vaccine approved for production❓ 1⃣ Pre-approval stage following clinical trials 2⃣ Regulatory assessment & approval 3⃣ WHO prequalification & approval 4⃣ Ready for production Find out more in detail 👉https://t.co/oLeDZSpZj6 https://t.co/o0W2t6YSNy

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