The Delta Variant, which is said to have led the second wave of coronavirus in India, has been a matter of concern for many scientists and experts. The World Health Organization (WHO) recently categorised the deadly variant as a 'variant of concern', stating the serious dangers it can pose to people's health and physical well-being.

from Times of India https://timesofindia.indiatimes.com/life-style/health-fitness/health-news/explainer-why-does-the-delta-variant-spread-so-fast/photostory/84819747.cms