To give you an honest answer. Maybe the application asks if you are HIV positive but it does not mean you have to tell them you are. I actually think it goes to show you that our world still attaches a stigma about HIV. Its morally wrong for that to even be a question on an application. It will not prevent transmission from healthcare worker to patient. Its an invasion of privacy. So what I 100 percent firmly believe you should do is ignore that very ignorant, rude and personal question and keep your personal, medical issue to yourself.