WHO monitoring 2 more Omicron sub-variants known as BA.4 and BA.5. BA.4 found so far in South Africa, Denmark, Botswana and parts of the U.K.
Thomson ReutersThis transmission electron microscope image shows SARS-CoV-2, the virus that causes COVID-19, isolated from a patient in the U.S. Virus particles are shown emerging from the surface of cells cultured in the lab.
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