To my knowledge, I have not been placed in any sort of isolation chamber, nor have I been given food which is substantially different from what the ponies themselves eat (they have provided pork and fish for us, which the cook does not mind, but the unicorn assistant finds distasteful). Thus far, I have not experienced any illnesses which I could attribute to an alien pathogen or a vitamin deficiency, suggesting that they seek out planets which are biologically similar to their own, and that they have a method of purifying or sterilizing harmful germs. As I mentioned previously, their medical technology appears to be far more advanced than our own.