(CNN) The White House coronavirus task force warned states of incomplete and "unstable" Covid-19 data due to the ongoing holiday season, making it difficult to track the pandemic's trajectory as concerns rise over continued or accelerated spread. "Data are currently unstable, outside of daily hospital admissions, due to inconsistent reporting and incomplete data over the holidays; there will be a reporting 'surge' in cases and deaths as reporting catches up," the task force said in multiple reports sent to state officials dated December 27 and obtained by CNN. As travelers break pandemic air travel records across the country this week, task force officials, including US Surgeon General Jerome Adams and Dr. Anthony Fauci, have expressed concern about a surge upon a surge . This week's reports, however, suggested it may be difficult to immediately observe that in the data in some places. And while there has been improvement of cases in "most of the Upper Midwest, Northern Plains, and Rocky Mountain states," the reports suggested "virus levels are still high and any post-holiday surge will be evident" in those places.

Source: CNN December 29, 2020 23:37 UTC