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The CDC said it doesn’t yet know how easily the omicron variant spreads, the severity of illness it causes or how effective current vaccines and medications are against the strain.

While it has been dubbed a “variant of concern,” there is still much unknown about the new variant, including how quickly it spreads, whether it causes more or less severe disease than previous variants and how effective current vaccines are against it.

Stocks fell on Wall Street Tuesday after the head of a major vaccine maker expressed concern about how effective current jabs will be against the new variant of the coronavirus.

It is unclear how effective current vaccines may be against the new variant.

The paper said it remained to be seen how effective current vaccines were against 501Y.V2, which would only be determined by large-scale clinical trials.