New variant stokes concern but vaccines still likely to work

Dr. Hatziioannou and her colleagues have been able to produce mutant spike proteins in their laboratory that make viruses highly resistant to Covid-19 antibodies. She said that Omicron has many mutations in the same regions of the spike protein pinpointed in their own research. “The overlap is pretty striking,” she said.

That overlap has Dr. Hatziioannou concerned that Omicron will be able to evade some of the antibodies that people have acquired either from vaccines or from Covid-19 infections. Some monoclonal antibody treatments won’t work against Omicron either, she predicted, because the variant’s spike protein is protected from them.

Still, vaccines are expected to provide some protection against Omicron because they stimulate not only antibodies but immune cells that can attack infected cells, Dr. Hatziioannou said. Mutations to the spike protein do not blunt that immune-cell response.