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2023 Continues Virus Trends with Holiday Impacts Anticipated

It may be a new year, but influenza, RSV, and COVID cases are all continuing to have an impact as we move into 2023. Currently RSV cases are showing a decline; flu is trending downward in most states with a few still going up, but COVID cases are beginning to show an upward trend. But don’t count out any of the diseases yet – we expect the impacts of holiday travel and gatherings to begin to show in the next several weeks. This could be particularly impactful given the number of weather-related travel issues and airport crowding that resulted.

Specifically, regarding COVID, there are now at least 17 Omicron subvariants in the U.S. with a new variant (XBB.1.5) increasing in the Northeast. We would expect there to be some additional fallout with China abandoning its zero-COVID policy, and time will tell how significant this will be in the U.S. The primary circulating variant in China is BF.7 which has been circulating in the U.S. for months. Additionally, if a new Variant of Concern (VOC) were to emerge, the CDC has implemented surveillance testing requirements for air passengers from China, Hong Kong, and Macau.

CDC’s Traveler Genomic Surveillance program (TGS) also has played a part in helping to provide an early warning system for the detection of new variants, as well as non-COVID-related pathogens. The program, for which arriving international travelers volunteer to provide nasal swabs which are pooled, tested and used to inform genomic surveillance, is credited with finding BQ.1.1 and other VOCs. Program expansion is planned to include more airports, flights, and individual sampling.

With all this, we see at least the first couple months of 2023 as a continuation of 2022, with advice to businesses to continue maintaining a wellness watch and asking those who are ill to stay home. The holiday impacts are likely to show over the next weeks, increasing the potential for transmission and need for protections.

COVID Risk Matrix:


Infectious Disease News

  • A vaccine recap for 2022. Updated COVID-19 shots, including bivalent boosters, dominated news. Progress was reported against development of vaccines against malaria, Ebola and cancer. It’s not all good news, however – people planned to skip influenza vaccines, record numbers of children missed measles vaccines globally, and a case of vaccine-derived polio in New York raised concerns of potential poliovirus spread.
  • Influenza. Flu cases remain widespread and high but declining in most areas across the US. The season total for pediatric flu deaths in the US is at 51. There are pockets of increases in Vermont, Maine, and England. A mask order has been ordered as a result of the highest ever levels of flu at Herefordshire hospitals in the UK.
  • Measles. Vaccine hesitancy is blamed for rises in measles cases around the world.
  • COVID. As a result of China’s case surge, the CDC has announced COVID-19 testing requirements for passengers arriving from China, Hong Kong, and Macau to slow the spread of the virus into the US. Beginning on January 5, all passengers ages 2 and older originating from China are required to test no more than 2 days before departure and show a negative test result to the airline before departure. This applies to all persons, regardless of vaccination status.

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