Virus-neutralizing antibody test was used to determine the proportion (%) of ReCV-positive serum samples in six different species of NHPs housed at three different NPRCs: Tulane (TNPRC), New England (NENPRC) and South-West Foundation (SNPRC). Serum samples were tested at a single dilution (1:20) for their ability to neutralize the 100 TCID50 of the Tulane virus, serotype 1. Capital letter acronyms below X-axis indicate the species: MM = Macaca mulatta (Rhesus macaque), MF = Macaca fascicularis (Cynomolgus or crab-eating monkey), MN = Macaca nemestrina (Pig-tailed macaque), CJ = Callithrix jacchus (common marmoset), PH = Papio hamadryas (Hamadrayas baboon) and PT = Pan troglodytes (common chimpanzee). Capital single letters stand for different categories of animals: A = juvenile (<3 years of age) female, B = adult female, C = juvenile male and D = adult male.