Data irregularities: Data reporting is often delayed on weekends and around major U.S. holidays. Additionally, some states have scaled back how often they report new data, creating more spikes and dips in the daily data.
The daily averages are 7-day averages of new cases and deaths for the week ending January 31. The 2-week trend refers to the percent change in the 7-day average vs. 2 weeks prior.