Rt Hon JACINDA ARDERN: All contacts are required to isolate. They are in isolation. They in some cases have not yet had their final day 12 tests, or in other cases they're not yet overdue them. Yesterday, if I recall correctly, amongst the numbers that we reported, of those contacts that we had, roughly 40 percent of them returned positive results on their day 12 test, so it does demonstrate that they're important. You then need to contact trace around those individuals and ensure that if they have exposure events, there aren't knock-on cases. So even though they're isolated, caution would still suggest keeping the alert levels where they are, not only till we get through that period but also because we cannot be 100 percent certain we have every known contact. 