I thought MERS is being linked to Camel’s Milk and drinking camel urine..not that the camels in the US came from the Mideast (one would hope, anyway).
I am not sure if MERS virus has been found in camel milk or urine, although some research has showed that the virus survives very well in camel milk.
However, there are many pathogens that thrive in milk of any species, and an animal that is sick—even without symptoms—can shed quite a lot of viruses and/or bacteria into the milk. No amount of sanitizing the udder will prevent microorganisms from entering the milk prior to milking.
You may know it as Bud Lite.