Total morbidity rate linked to population size The smaller a population over the range 1,000 to ~3.5 million, the higher the total morbidity rate, given identical organisms ( Figure 6 ). It is intuitively expected that population size will affect morbidity since, for any given network of contacts connecting individuals in populations, the chance of the epidemic spreading during the window prior to the development of immunity in parts of the population increases as the population size decreases. This This is the simulation that was imported for comparison Figure 3 This is the simulation that was imported for comparison. Vertical scale 1000 per demarcation. Horizontal scale one year per demarcation. Upper white line is total population with standard removal rate. effect is most striking when very small populations in the order of 1,000 are examined. Literature data regarding this in real world populations are sparse. However, there are indications from historical accounts of small populations in the new world that a link between population size and morbidity is observable in real world populations [38] [39] [40] [41] [42] [43] . The most recent such account is from Heyerdahl in the Pacific in the mid 20 th century [44] .