 This study investigates the correlation between COVID-19 fatalities and potential comorbidities globally on a nation by nation basis, using national compilations of direct measures of immune system strength as a proxy for susceptibility to other serious diseases. The analysis exposes some reasons that may underlie the degree to which advanced age increases the risk of mortality of infection with SARS-CoV-2 and confirms early clinical observations that infection presents an increased risk to persons over 65 years old. However, it does not support government agency suggestions that the risks are much greater for certain common potential comorbidities. This article was authored by William Alfons Barletta.