The Killer Flu and Chiropractic

I took this from the November 2009 newsletter written by Dr. Tedd Koren:

These are statistics from the 1918-1919 killer flu which killed millions under medical care:

• The Palmer School of Chiropractic had one death out of 1,635 cases while Iowa DCs reported 6 deaths out of 4,735 cases.
• MDs (Davenport) lost one patient out of every 15 (6,116 deaths out of 93,590 patients).

[Rhodes WR. The Official History of Chiropractic in Texas. Austin, TX: Texas Chiropractic Association. 1978 andChiropractic statistics. The Chiropractic Research and Review Service. Indianapolis, IN: Burton Shields Press. 1925.]

Once infected by a virus, why would a chiropractic patient do better than a medical patient back then?

And today, 90 years later, wouldn't the same hold true?