A new Covid subvariant is under the radar of the World Health Organization (WHO) and is also causing concern in India. This Omicron subvariant, XBB.1.16, dubbed as Arcturus has caused a surge in new cases in India in the last few weeks. Indian central government has asked people not to panic as they have made all the preparations and conducted mock drills in hospitals as a refresher course for doctors to help Covid patients. Cases linked to this variant are also rising in Singapore, the US and Australia among others.