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As COVID-19 cases and hospitalizations begin to increase again in the U.S., public health officials are monitoring several new Omicron subvariants that are contributing to the case numbers.

In some parts of the U.S., a spinoff of the BA.2 subvariant called BA.2.12.1 is the main culprit. In other countries, Omicron subvariants called BA.4 and BA.5 are driving up cases, according to CNN.

All three subvariants appear to be spreading more quickly than BA.2 and creating their own COVID-19 waves. Head over to WebMD to read the full story.