With staphylococcus aureus what is the primary reservoir?

Answer 1

In the medical community human skin is commonly considered the reservoir for S. aureus. More specifically, in the infection control community the most common place to find S. aureus and MRSA are the nares and perinium - that's the first place we sample for culture swabs. That being said, humans aren't the only reservoirs for S. aureus, it's also been found in herd animals.