No? No, you gave a very good answer. Thank you. Thank you very much. Question. There about 5000 tests, I believe the public health agency wants to test to 5000 people per day. Is there a cost assessment to do for the benefit? Because and the response that I received from public health, is that we were there not able to establish the cost benefit. Yes, but But 5000 tests per day. Are there any other means to do so for example, wastewater detection, which allows us to see the presence of the different variants and knowing that variance coming into the country? Well, it's not necessarily through that measure that we're going to stop them from coming in. So with the cost of benefit assessment, is this something that you might examine for the full? Answer? That's an excellent question, have I? I will say, a little more perhaps, than I should, and then I'll give the floor to Dr. Tam. But if you give me a minute, the agency has to review its different measures by examining the advantages, as well as the costs. So the costs for the government and the cost for people who are being tested, even though it is only a few people that get tested, they do need to take the time to do it. So it is a part of the social costs that the agencies to take into account. That said, there aren't many other ways to proceed in order to have data on where people were coming from, and to have data on positive results. And I will ask Dr. Tim, to give more detail, because even if we're making progress on wastewater data, this is a method that does not give us data that is as specific as the data coming from people entering Canada. And before giving the floor to Dr. Tam. I would like to say that public health agency is trying to work more closely with other countries. They are also developing alternatives to PCR tests. And that's why we need to increase our collaboration because there are more people traveling between these countries and Canada. And this can lead to the importation of COVID-19. And we want to better understand everything so that we can react better and knowing more about the countries of origin is important for us, Dr. Tam, if you have anything to add on the work currently being done by the agency, which is important to work to examine the costs and the advantages of the different ways to follow the importation of COVID-19 in Canada. Answer thank you again, you gave a very comprehensive response. In my view, it is important to re examine the goals