India's coronavirus infection tally surged past 20 million, boosted by near 360,000 new cases. The country registered over 3,400 deaths over the last 24 hours. Dr. Neeraj Ravishankar, a doctor from southern India, and Professor Wu Zhiwei, a public health expert from Nanjing University's Medical School, shared with CGTN their insights. Wu said slow vaccination rollout is one of the factors to blame for India's second wave.