First of all, all applicants for permanent residency must undergo a medical exam and submit their results to CIC. If, for example, they have a serious condition, which would represent an excessive burden on Canada's publicly funded health care system, they would be deemed medically inadmissible.
Similarly, applicants with temporary residency who have higher public health risks are required to undergo an immigration medical examination to identify the kinds of diseases that you've mentioned, Mr. Leung. I would point out that the last Auditor General's report raised concerns that there are a number of medical conditions listed by the Public Health Agency of Canada we do not screen against.
I would invite input from the committee as to whether we should expand the number of diseases we should screen against. I think we also need to look at our partners on this. It's always a balance between public health and safety, and accessibility to Canada.
I don't think we want to ask all visitors to go through a rigorous test for every conceivable condition. We have to use what we call risk management principles in assessing whether someone constitutes a potential health risk to Canada.