That's probably an artifact of the reporting process. Most hospitals don't report during the weekends.

Indeed - there have been many cases of where when things have been reported is what gets graphed instead of the actual dates of particular statistics.

The lack of consistent context and framing around the human malware has made most discussions of it pretty useless, but easy to skew in a particular direction for those wishing to make political hay out of a trend (on either side - very few have clean hands in this regard).

I also wouldn't be surprised if there seasonality in medical care, like people receive worse care certain days, for some reason.