A new Omicron sub-variant, known as the XBB, has been driving a significant surge in COVID-19 cases in Singapore, local media reported.

The island country in Southeast Asia reported an average of 7,716 local cases per day in the past week, compared with a daily average of 2,000 last month, according to data from Singapore's Ministry of Health (MOH).

So what's XBB and how dangerous is thisnew strain? Here is what we know so far.