Methods
Serum samples obtained from 49 adult and 20 juvenile Chacma baboons caught in the Western Cape, Eastern Cape, and Limpopo Provinces of South Africa were stored at −70°C. Liver tissue (fresh frozen and formalin-fixed) was obtained from 1 of the adult wild-caught baboons (hereinafter referred to as baboon 9732), which was euthanized for medical and ethical reasons. Permission for this study was obtained from the Animal Ethics Committee of the University of the Witwatersrand. All procedures were approved by this Committee. Baboons were provided care according to the guidelines of the South African Medical Research Council.