There are limited available data, and no peer-reviewed evidence, on vaccine efficacy or effectiveness to date for Omicron. Preliminary evidence suggests a reduction in vaccine efficacy against infection & transmission associated with Omicron https://t.co/tOu6iIvFZP #COVID19 https://t.co/HRxoRZOJvi— World Health Organization (WHO) (@WHO) December 12, 2021
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