What do we know about sub-variants of Omicron so far? Are they more transmissible? Do they cause more severe disease? How is the risk of infection being perceived by the experts and the public? WHO's Dr Maria Van Kerkhove explains in Science in 5. [Credit: World Health Organisation] About NDTV: NDTV brings you unbiased and comprehensive coverage of news and entertainment programmes in India and abroad. NDTV delivers reliable information across all platforms: TV, Internet and Mobile. Follow us on Social Media: Like us on Facebook: / ndtv Follow us on Twitter: / ndtv Follow us on Koo: https://www.kooapp.com/profile/ndtv Follow us on Instagram: / ndtv Join NDTV on Telegram Messenger: https://t.me/NDTVbot/?start=hi Follow us on Google News for Breaking and Latest News Updates: NDTV: https://bit.ly/3e5ngbP NDTV India (Hindi News): https://bit.ly/3mNVwMY Download NDTV Mobile Apps: http://www.ndtv.com/page/apps #WHO #CoronaVirus #Covid19 #BreakingNews #LatestNews #TodayNews #News #IndiaNews