How is our Covid-19 vaccine faring against an ever-evolving Omicron? Jamie Morton explains what scientists are learning about its effectiveness - and why regular boosts remain vital for the vulnerable. What’s the vaccine doing to stop us catching Covid-19? That’s proving an increasingly difficult question for scientists to answer, as our immune landscape grows ever more complex. Most of us now have what’s called hybrid immunity - or the immune “memory” gained from both multiple vaccinations and infection - and few of us are testing, making it tougher to understand how the vaccine is performing.
We also know that Omicron has evolved much since its XBB1.5 subvariant, the target strain of our current vaccine , first arrived in New Zealand a year and a half ago..
