Quantitative PCR products of BH66, 5 of the Sangeh macaques (M. fascicularis), and 13 pet macaques (M. tonkeana, M. maura, and M. fascicularis) from Sulawesi, Indonesia, were cloned at least twice, sequenced, and compared with published sequences from a rhesus macaque (M. mulatta) (SFV-1mac, M55279), an African green monkey (Cercopithecus aethiops) (SFV-3agm, M74895), and a chimpanzee (Pan troglodytes) (SFVcpz, U04327). As shown in Figure 2 , SFV from BH66 was most closely related to an SFV sequence amplified from 1 of the macaques at the Sangeh Monkey Temple (BP6). To verify that the BH66 sample was of human origin and not a mislabeled sample from an SFV-infected monkey, we amplified a small fragment from the 12S ribosomal mitochondrial DNA from 2 healthy unexposed humans, BH66, several macaque species, and African green monkeys; cloned the products; and derived DNA sequences. Phylogenetic analysis (Figure 3) showed that the human DNA sample grouped with mitochondrial DNA sequences from humans, confirming that the BH66 sample was from a human. Lymphocytes from BH66 were not available for isolation of SFV directly.