Covid-19 cases are surging upward again in the United States, and public health experts are warning the fast-spreading omicron variant may push the number of infections to their highest level yet. Whether this surge will be followed by an unprecedented level of hospitalization and death is uncertain, but researchers say it’s possible the most devastating phase of the pandemic is yet to come.

Already, countries like South Africa, the United Kingdom, and Denmark have seen sharp spikes in new Covid-19 cases, with some areas reaching record highs. South Africa has reported far fewer hospitalizations from omicron compared to previous waves, but the UK is is in the midst of a sharp rise in hospitalizations, about 30 percent higher week over week.

The big reason is that omicron appears to spread far more readily than the delta variant that has been dominant worldwide since the summer — omicron is 25 to 50 percent more transmissible, according to some UK estimates.

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