No one knows how effective vaccines will be in stopping people catching the newly discovered and fast-spreading Omicron variant of Covid-19 or how well they will protect against severe illness. Lab tests are under way to determine vaccine efficacy against Omicron with results expected within weeks. In the meantime the Delta variant remains dominant and […]
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PARIS, Dec 3 Omicron is a variant of Covid-19 first sequenced in South Africa with cases now present in over 20 countries and on all continents. It was named only a week ago and it will take time to understand its impact on the pandemic. Here is a summary of what we know and what questions.