Blah you applied to MD and then when you ddint' get immediate interviews you realized you should use DO as your safeties, right?
I guess many people do this, but make sure you realize that DO ISN'T LESSER, necause adcoms will sniff out this attitude in your interview if you have it.
If you honestly are interested in DO then best of luck and let me know if there's any questions you have. You MUST get the AACOMAS app in now! Get a DO LOR as well and have him send it to your letter service or to each school immediately.
That is all.