A report from the CDC indicates that a new strain of norovirus, GII.17, has disrupted the expected seasonal patterns of outbreaks in the U.S. Previously, norovirus cases peaked in December, but last year saw a surge beginning in October due to GII.17, which has since become prevalent in the majority of cases. This change raises questions about future outbreak timings, particularly if GII.17 could continue causing earlier seasons as GII.4 becomes less dominant. Similar patterns have been observed in other countries, pointing to a broader shift in norovirus dynamics.
"Continued surveillance is needed to determine if this genotype remains the dominant genotype, as well as whether the norovirus season continues to start earlier than previous years."
"GII.4 viruses are the main driver for norovirus seasonality. With the decrease of GII.4 outbreaks since 2024, whether GII.17 viruses will continue to cause an earlier onset of the norovirus season cannot yet be determined."
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