Artículo
Omicron vs. Delta – do we need new vaccines?
![Omicron vs. Delta – do we need new vaccines?](http://d34t42wpe6kclg.cloudfront.net/co/live/publication/3/5/8/358/pictures/omicron-vs-delta-do-we-need-new-vaccines-head-media-IMS_720x0_RKAR_IME.jpg)
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