Fortune magazine published an article describing “How the Humane Society convinced nearly 100 food companies to take their animals out of cages.”  This is why that is not necessarily a good thing for the animals or the people who care for them.

In many cases, prohibiting individual and cage housing actually creates a

Approximately 1500 pathogenic organisms exist on the planet (that we know of), of which a majority (75%) are transmissible from animals to humans (or visa versa).  Some of historic significance include bubonic plague, rabies, and brucella (Ranchers, officials uneasy about brucellosis).

There are other infectious diseases that are not shared between species, but