Data dictionary ID: Unique ID for each animal at the sampling site, attributed in order of sampling Ages Over 1 year=1; Less than 1 year=0 Counties: Kiambu=1 Nairobi=2 Kajiado=3 Homabay=4 Kitui=5 Bungoma=6 Trans-Nzoia=7 Machakos=9 Bomet=9 Nakuru=10 Kisii=11 Unkown= Unspecified source of pigs, mainly location not given because the traders sourced from different sites and cannot identify a given pig with the source Lab results 1=positive; 0=Negative using the Ag-ELISA assay described in the manuscript Methods for data collection (as per the manuscript: The study was conducted in one of the largest independent pork abattoirs in Kenya (hereafter referred to as the study facility), which slaughterers approximately 60-90 pigs a day. This facility obtains pigs predominately from small scale farmers across several regions of Kenya and then supplies unprocessed pork to butcheries in Nairobi and its surrounding areas. Individual interviews were carried out with pig traders and farmers present at the abattoir using a structured questionnaire, to obtain information regarding the source (including county of origin) of the sampled pigs. Observations were made by the sampling team as to whether carcasses or organs were condemned due to the presence of cysticercosis or other causes. In addition, the government meat inspector positioned at the facility provided a weekly update on the detection of cysticercosis amongst slaughtered pigs during routine meat inspection. Copies of the movement permits and certificates of transport were obtained from the meat inspector at the abattoir to determine the sources of pigs and destinations of pork respectively. All pigs presented for slaughter at the study facility between the months of October and December 2014 were considered eligible for sampling. To obtain an adequate sample size for the estimation of population prevalence with a 95% confidence level and a precision of 5%, a 32.8% expected prevalence rate was used, based upon the most recent data available from Kenya at the time of study design. A design effect of 2 was assumed to cater for the potential clustering of pigs based on the different sources of origin. The minimum sample size required was calculated as 678, which was rounded up to 700 pigs. A systematic random sampling method was used to select pigs for sampling. The first pig presented for slaughter was sampled, followed by every fifth. An average of 15 pigs were sampled daily, over a period of 47 days. Pig snares were used for restraint and blood collected from the cranial vena cava into a labeled 10 ml serum tube using a BD Vacutainer¨ needle. The samples were transported in a cool box with ice packs to the International Livestock Research Institute (ILRI), Nairobi, within five hours of collection. Samples were centrifuged at 2500 rpm for 20 minutes. Serum was aspirated using a sterile disposable pipette and transferred into cryo-tubes, labeled with the individual pig barcodes, then stored at -80¡C for testing at a later date. A commercial enzyme-linked immunosorbent assay kit, the apDia cysticercosis Antigen (Ag) ELISA (apDia Turnhout, Belgium), was used to detect circulating antigens for Taenia spp. in porcine sera samples that were tested in duplicate according to the manufacturerÕs guidelines, with the cut-off value calculated per plate as twice the mean OD of the negative control. EMF February 2019