Well, the decline in COVID-19 cases started on the 10th, so it shouldn't be that. The vaccine is probably playing a role, but IDK if it can account for all of it because the drop has been enormous. I kind of wonder if there've been some state laws passed in January that were effective in slowing the spread. I also kinda imagine that New Years celebrations ending put a damper on the virus's spread but that's extremely speculative, of course.