If you've had Omicron before, are you safe from infection by the new variants?

A woman wears a face shield to protect against COVID-19 at a taxi rank in Soweto, South Africa, Tuesday, April 5, 2022. South Africa is seeing a rapid surge of COVID-19 cases from a sub-variant of omicron, say health experts. (Denis Farrell / AP)

When it comes to omicron, one thing seems certain to bioinformatician Shishi Luo: Another surge will occur.

That's because new versions of omicron are emerging — here in the United States and in other parts of the world as well, like South Africa.