{Reference Type}: Journal Article {Title}: Gastrointestinal parasites in captive olive baboons in a UK safari park. {Author}: Juhasz A;Spiers E;Tinsley E;Chapman E;Shaw W;Head M;Cunningham LJ;Archer J;Jones S;Haines LR;Davies Walsh N;Johnson B;Quayle J;Jones J;LaCourse EJ;Cracknell J;Stothard JR; {Journal}: Parasitology {Volume}: 150 {Issue}: 12 {Year}: 2023 Oct 1 {Factor}: 3.243 {DOI}: 10.1017/S0031182023000823 {Abstract}: From the safety inside vehicles, Knowsley Safari offers visitors a close-up encounter with captive olive baboons. As exiting vehicles may be contaminated with baboon stool, a comprehensive coprological inspection was conducted to address public health concerns. Baboon stools were obtained from vehicles, and sleeping areas, inclusive of video analysis of baboon–vehicle interactions. A purposely selected 4-day sampling period enabled comparative inspections of 2662 vehicles, with a total of 669 baboon stools examined (371 from vehicles and 298 from sleeping areas). As informed by our pilot study, front-line diagnostic methods were: QUIK-CHEK rapid diagnostic test (RDT) (Giardia and Cryptosporidium), Kato–Katz coproscopy (Trichuris) and charcoal culture (Strongyloides). Some 13.9% of vehicles were contaminated with baboon stool. Prevalence of giardiasis was 37.4% while cryptosporidiosis was <0.01%, however, an absence of faecal cysts by quality control coproscopy, alongside lower than the expected levels of Giardia-specific DNA, judged RDT results as misleading, grossly overestimating prevalence. Prevalence of trichuriasis was 48.0% and strongyloidiasis was 13.7%, a first report of Strongyloides fuelleborni in UK. We advise regular blanket administration(s) of anthelminthics to the colony, exploring pour-on formulations, thereafter, smaller-scale indicator surveys would be adequate.