Patients 19 and 20 who have tested positive for Covid-19 are Waikato residents who returned from overseas this month.
A woman in her 20s arrived from Sydney on March 8 and a man in his 70s arrived from Europe on Sunday.
Their flight numbers are still to be released by the Ministry of Health in an effort to trace close contacts on those flights.
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It comes as the Avantidrome at Cambridge closed today after a person with coronavirus symptoms was at the cycling centre, and a staff member at Hamilton City Council is in self-isolation awaiting Covid-19 test results.