Excess exercise has negative effects on Immune System

I just read an article regarding findings from Andrea Verini-Supplizi, DVM from the University of Perugia. A recent study Dr. Verini-Supplizi took part in confirms that excess strenous activity does indeed harm the immune system of our equine athletes.

The first thing I thought of was that these poor horses often times are vaccinated over and over as well. Another assault on the immune system. Then many are sprayed with toxic pesticides and given too much grain and not enough forage. No wonder horses are more fragile then ever.