We report the earliest known cluster of SARS-CoV-2 infection so far reported, which occurred in New Zealand in late February 2020 . The cluster includes one confirmed and five probable cases . The cluster was identified while investigating a weak positive nasopharyngeal swab (NPS) polymerase chain reaction (PCR) test that was returned by a male in his 60s in September 2020 . The PCR result, combined with a clear clinical and epidemiological history of a COVID-19 like illness in late February 2020, prompted serological testing . SARS-CoV-2 IgG antibodies were detected and supported historical infection . Serology was also reactive for five close contacts who had also experienced a COVID-19 like illness in February 2020 . Combined case histories and investigations suggest that this local cluster was import related, with the index case identified as a family member visiting from Italy in February . Case investigation also suggests this cluster was active in New Zealand prior to any previously documented local cases, indicating that SARS-CoV-2 was present and local transmission was occurring earlier than initially suspected . A weak positive PCR result, six months after acute infection, supports international evidence that SARS-CoV-2 genetic material can be detected for several months after initial COVID-19 infection, and that this is not necessarily indicative of infectivity.