Chief Scientist in the World Health Organisation, Dr. Soumya Swaminathan said that testing is key to successful control of Covid-19 pandemic and all the states should enhance testing capacity.<br />''<span style="color: #222222;"><br />''In a tweet today, she said, high throughput facilities will increase COVID testing in Delhi NCR, Mumbai and Kolkata. Admiring India's effort in increasing the testing capacity, Dr. Saumya said, India is now conducting around more than 5.5 lakh tests per day and planning to take it to one million.</span><br />