COVID-19 Omicron BA.4

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Aurochs. Bos primigenius. Skeleton. Extinct animal. Skeleton of an Aurochs, an extinct wild ox.

6 Animals We Ate Into Extinction

Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere

Why Do Some Cicadas Appear Only Every 17 Years?

Dancers at a Cinco de Mayo festival at the Mission District, San Francisco, California. (Photo dated 2019.) holidays

Is Cinco de Mayo Mexico's Independence Day?

US Marines firing at Fallujah, Iraq, during the Second Battle of Fallujah in November 2004. Operation Iraqi Freedom, Iraq War.

Timeline of the 2000s

King Cobra snake in Malaysia. (reptile)

9 of the World’s Deadliest Snakes

Figure 13: A Maxim machine gun, belt-fed and water-cooled, operated by German infantrymen, World War I.

7 Deadliest Weapons in History

Drinking water is poured into a glass.

Water Fluoridation: Just the Facts

COVID-19 Omicron BA.4

virus subvariant

Learn about this topic in these articles:

COVID-19

In COVID-19
…multiple sublineages of concern, including BA.4 and BA.5, which are highly infectious, and BA.2, which gave rise to XBB.1.5—a highly transmissible variant, noted for its heightened ability to bind to cells and to replicate.
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