While over 100 vaccines are currently under pre-clinical trials and a couple of those have entered human trial stage, leading health experts have raised alarming questions about what if the world never sees a COVID-10 vaccine, as in the case of HIV and even dengue where there is no vaccine even after years of research.<br /><br /> कुछ साइंटिस्ट का कहना है कि कोरोना वैक्सीन इतना जल्द <br />संभव नहीं हो सकता। कोरोना वायरस का वैक्सीन बनाने में कम से कम 16 साल लग सकते हैं
