Two Omicron sub-variants - BA.4 and BA.5 - appear to escape antibody responses amongst those with previous Covid infection and those fully vaccinated and boosted.
However, vaccines are still expected to provide substantial protection against severe disease.
At the moment, pharmaceuticals are working on updated shots to elicit a stronger immune response against these variants.
The Omicron variants escaping from antibodies means that there’s a higher risk for reinfection, even in people who had prior immunity against the virus.