The content originally appeared on: CNN (CNN)The Omicron coronavirus variant may be reaching around the world, but different places are seeing significantly different effects. In the United States, Covid-19 case numbers have been falling since January. They may have hit a plateau as a subvariant of Omicron, BA.2, becomes the main cause of infections. But in China, an area of the world that has had few spikes during the pandemic, there has been a dramatic increase in cases as BA.2 […]