Abigail Dougherty/Stuff People have been lining up down the street to be tested at Papatoetoe High School after a student went to class, not knowing she had Covid-19. As authorities scramble to try figure out how Covid-19 got into the community, Stuff reporter John Anthony looks at what rules govern two areas where the virus may have slipped through the cracks. The source of New Zealand's latest resurgence of Covid-19 is still unknown, but a traveller in transit or an international air crew member are both possible candidates. iStock Air New Zealand staff are mostly exempt from a 14-day isolation or quarantine period.