If you properly quarantine your new BCI for a month, chances are very slim that you will pass anything along. IF anything though, you are more likely to pass disease on to your python then to your king and corn. IBD (inclusion body disease) seems to be of particular concern amoungst herpers. IBD can be carried by boas that dont show signs of any illness for quite some time while if transmitted to a python, will kill them rather quickly. There is no cure as of yet for inclusion body disease. It has a 100% fatality rate. That is why I keep my BCI in a different room from my pythons.

Even after a month of quarantine it is POSSIBLE to spread diseases, just not likely. You will usually know within a month if your snake is sick.