Omicron vaccine trials begin

Photo credit: U.S. Secretary of Defense – Flickr, CC BY 2.0, link.

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Omicron vaccine trials begin.

Covid-19 omicron waves peak

Photo credit: Ted Eytan from Washington, DC, USA – 2021.12.29 Rapid COVID Test Pickup, Washington, DC USA 363 06015, CC BY-SA 2.0, link.

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Covid-19 omicron waves peak.