Let me start by mentioning that the post-arrival testing is actually a very important tool for us to monitor the prevalence of COVID-19 in fully vaccinated travellers arriving, specifically to monitor new variants that might be of concern because that is how we track them, and we can take action. Also, we identify travellers for whom compliance and enforcement activities are required, so if they're not actually vaccinated, they are directed to a DQF, or they are directed to do day 1 and day 8 tests. That is an important piece for us and our programming.
Wastewater testing is a tool that we have been using in the cities, where we are using a lot of stuff. Major cities have been able to test the wastewater and give us an early warning signal about what is circulating in those communities. Accordingly, the individual choices as well as the community availability of the tools can be upped, such as making sure there is masking, for example, or making sure individuals take particular precautions around going into a cumulative setting. Wastewater continues to be a part of our tool kit as we move forward.