Tale of two Covid variants: What makes Omicron more infectious than Delta  

Scientists warn that high mutations in Omicron variant may lead to re-infection and breakthrough infections. The variant could spark explosive increase in Covid cases in other countries as well, early data shows.

Omicron, the new variant of coronavirus, is said to be more infectious than others, including the feared Delta strain. Unusual patterns of mutations appeared to be accountable for the speed of the spread of this new variant.

Omicron replaced the Delta strain in a relatively short time in South Africa.