What we know about the illness caused by the new Omicron subvariants

Omicron symptoms: What we know about illness caused by the new subvariants Symptoms of omicron and the BA.4 and BA.5 subvariants are similar, doctors say. They're all still Covid, and they can still cause severe disease. NBC News

The omicron variant of the coronavirus, along with its subvariants, continues to be the dominant cause of Covid infections in the U.S. One subvariant, called BA.5, is behind the majority of new infections, but other omicron subvariants, and even subvariants of subvariants, are also being detected.

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