同一篇報道解釋還是很合理的。

https://www.reuters.com/article/factcheck-immunesystem-covid19-vaccines/fact-check-danish-study-did-not-conclude-that-covid-19-vaccines-adversely-impact-immune-systems-or-that-covid-19-vaccines-are-completely-ineffective-against-the-omicron-variant-idUSL1N2TE17B

 

“Denmark was very quick to conduct sequencing and to identify the first generations of Omicron cases in the country. Cases during this period occurred to an exaggerated extent in those who were travelling internationally, and those in the social and professional circles of travellers, and were largely vaccinated. We expect therefore that there was an overrepresentation of vaccinated people among the first generations of Omicron cases identified in Denmark, not because the vaccines weren’t protective, but because the variant hadn’t spread far enough into the general population, including into the unvaccinated population, to make for comparable infection rates.” Dr Hansen told Reuters.