We are also implementing sewage testing. Over the summer, the Institute of Environmental Science and Research Ltd (ESR) tested the sensitivity of the sewage test, and now it's being used as part of this outbreak and the Northland outbreak. It is probably sensitive enough to detect a handful of cases. We think it's probably not sensitive enough to detect a single case. Through repeated use, we could probably confidently exclude community transmission. Performing sewage testing is not a glamourous role. After a machine has collected the sewage over a period of 24 hours with periodic collections, it then needs to be concentrated in the laboratory. I'm very grateful for the workers who have undertaken this work to make sure that we have this new tool that is not dependent on human behaviour as is polymerase chain reaction testing.