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However, there are still considerable uncertainties and unknowns regarding this variant, it said, repeating that sentiment on Monday.

First of all, experts don’t know yet just how transmissible the variant is and whether any increases are related to immune escape, intrinsic increased transmissibility, or both.

Secondly, there is uncertainty over how well vaccines protect against infection, transmission and clinical disease of different degrees of severity, and death. And third of all, there is uncertainty over whether the variant presents with a different severity profile.

The WHO has said it will take weeks to understand how the variant may affect diagnostics, therapeutics and vaccines. Preliminary evidence suggests the strain has an increased risk of reinfection, however.

Read more: A heavily mutated Covid variant emerges in southern Africa: Here’s what we know so far

Early data suggests the variant is spreading in South Africa more rapidly than previous variants did and that the variant could be starting to trigger a new wave of infections, according to an analysis by the Financial Times.

Covid symptoms linked to omicron have been described as “extremely mild” by the South African doctor who first raised the alarm over the new strain.

Read more: South African doctor who first spotted the omicron Covid variant explains the symptoms

It’s very important to remember that, so far, there have only been a small number of cases reported around the world — in several southern African countries and a smattering of cases in the U.K., France, Israel, Scotland, Belgium, the Netherlands, Germany, Italy, Australia, Canada and Hong Kong, but none yet in the U.S. — so it could take a while to fully understand what specific symptoms, if any, are attributable to the omicron variant on a wider scale.

It’s also too early to tell what degree of health risk the new variant poses at a global level; the international community has already seen several increasingly virulent strains of Covid-19, first with the “alpha” variant and then the “delta” variant, which is currently the globally dominant strain.

Covid vaccines have greatly helped to reduce severe infection, hospitalization and death, so new variants are closely monitored to assess whether, and how, they might impact the efficacy of vaccines.