South Africa study suggests Omicron could displace Delta
Research shows that people who were infected with Omicron, developed enhanced immunity to the Delta variant.
Tue Dec 28 2021
Study suggests Pfizer COVID-19 vaccine may only partially protect against Omicron
There was "a very large drop" in neutralization of the Omicron variant relative to an earlier strain of COVID-19, Alex Sigal said.
Wed Dec 08 2021