Many were hoping Delta would be the last in a chain of variants of increasing transmission and virulence. Not one but two new forms of Omicron, BA.1 and BA.2, have put a swift end to that hope.
The Omicron Surprise
Many were hoping Delta would be the last in a chain of variants of increasing transmission and virulence. Not one but two new forms of Omicron, BA.1 and BA.2, have put a swift end to that hope.