![Coronavirus digest: Fourth jab 'not enough' to fight omicron, study shows](https://cdn.newsserve.net/ONPglobe256.png)
Coronavirus digest: Fourth jab 'not enough' to fight omicron, study shows
Israeli researchers found that a fourth dose of a COVID-19 vaccine provided "only partial defense" against omicron. Meanwhile, Moderna plans to have a vaccine ready for the variant this spring. Follow DW for more.
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