This paper presents two new and independent lines of evidence — Lines 20 and 21 of the AO convergence framework — constituting what is termed here the Immunological Proof of deep civilisational isolation in Aotearoa New Zealand. Line 20 establishes that the epidemic diseases responsible for catastrophic Māori mortality at European contact were without exception zoonotic diseases of agricultural livestock origin, requiring the sustained co-habitation of dense human and domesticated animal populations to emerge, circulate, and maintain themselves in human immune memory. Pre-contact Aotearoa possessed no qualifying livestock reservoir species. Therefore, regardless of the duration of human habitation or the timing of founding migration, the biological preconditions for these diseases to exist in Aotearoa were absent. This is a statement of documented ecological fact, not inference. Line 21 establishes that immunity to these diseases, once acquired, degrades across generations in the absence of ongoing exposure. The 489-year window between the conventional 1280 CE first arrival date and European contact in 1769 CE is demonstrably insufficient to maintain immune memory inherited from any prior Eastern Polynesian contact with disease-carrying populations. Complete immunological naivety at European contact is therefore the expected outcome under any model — including the conventional model — that situates the founding population in a livestock-free environment. Together, Lines 20 and 21 establish that the immunological profile of Māori at European contact is not merely consistent with the Origin Reversal hypothesis (AO v5.0–v5.2). It is the required outcome of the documented ecological conditions of pre-contact Aotearoa, and constitutes independent forensic confirmation of civilisational isolation of a depth and completeness unaccounted for in any existing model of New Zealand prehistory. The paper also introduces Line 22: the Conservation Ethics Argument — the documented pre-contact Māori rāhui system as evidence of a civilisation of sufficient depth to have developed, tested, and institutionalised conservation responses to resource depletion over multiple generational cycles.
Nicolas Antony Brown (Fri,) studied this question.