China’s COVID-19 surge raises odds of new coronavirus mutant
Could the COVID-19 surge in China unleash a new coronavirus mutant on the world?
Scientists don’t know but worry that might happen. It could be similar to omicron variants circulating there now. It could be a combination of strains. Or something entirely different, they say.
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“China has a population that is very large and there’s limited immunity. And that seems to be the setting in which we may see an explosion of a new variant,” said Dr. Stuart Campbell Ray, an infectious disease expert at Johns Hopkins University.
Every new infection offers a chance for the coronavirus to mutate, and the virus is spreading rapidly in China.
The country of 1.4 billion has largely abandoned its “zero COVID” policy. Though overall reported vaccination rates are high, booster levels are lower, especially among older people. Domestic vaccines have proven less effective against serious infection than Western-made messenger RNA versions. Many were given more than a year ago, meaning immunity has waned.
The result? Fertile ground for the virus to change.
“When we’ve seen big waves of infection, it’s often followed by new variants being generated,” Ray said.
About three years ago, the original version of the coronavirus spread from China to the rest of the world and was eventually replaced by the delta variant, then omicron and its descendants, which continue plaguing the world today.
Dr. Shan-Lu Liu, who studies viruses at Ohio State University, said many existing omicron variants have been detected in China, including BF.7, which is extremely adept at evading immunity and is believed to be driving the current surge.
Experts said a partially immune population like China’s puts particular pressure on the virus to change. Ray compared the virus to a boxer that “learns to evade the skills that you have and adapt to get around those.”
One big unknown is whether a new variant will cause more severe disease. Experts say there’s no inherent biological reason the virus has to become milder over time.
“Much of the mildness we’ve experienced over the past six to 12 months in many parts of the world has been due to accumulated immunity either through vaccination or infection, not because the virus has changed” in severity, Ray said.
