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1、00-07-0202R.qxd8/17/20012:25PMPage1436EvaluationofconcurrentsheddingofbovinecoronavirusviatherespiratorytractandentericrouteinfeedlotcattleKyoung-OhCho,DVM,PhD;ArmandoE.Hoet,DVM;StevenC.Loerch,PhD;ThomasE.Wittum,PhD;LindaJ.Saif,PhDatedepitheliumofthesmallandlargeintestinesaswellObjective—Toassesst
2、herelationshipbetweenshed-12-16astherespiratorytract.dingofbovinecoronavirus(BCV)viatherespiratorytractandentericroutesandtheassociationwithFeedlotcattleareexposedtoamultitudeofinfec-weightgaininfeedlotcattle.tiousagentsduringtransportfromranchtoauctionmarkettofeedlot.17-19Infectionbyvirusesandbac
3、teriaAnimals—56crossbredsteers.iscommonamongthesecattle,andalthoughcattledoProcedures—Pairedfecalsamplesandnasalswabnotalwayshavesignsofclinicaldisease,mildtoseverespecimenswereobtainedandweretestedforBCV,respiratorytractdiseaseassociatedwiththebovineres-usingantigen-captureELISA.Pairedserumsample
4、sobtainedweretestedforantibodiestoBCV,usingpiratorydiseasecomplexiscommon.Recently,investi-antibody-detectionELISA.InformationwascollectedgatorshavedetectedandisolatedBCVfromnasalswabspecimensobtainedfromfeedlotcattle.20-23Cattleshed-onweightgain,clinicalsigns,andtreatmentsforentericandrespiratory
5、tractdiseaseduringthestudydingBCVviathenasalpassagesattimeofarrivalinaperiod.feedlothaveanincreasedriskfordevelopingrespirato-rytractdisease.24In1study,ahighmortalityassociatedResults—Numberofsamplespositiveforbovineres-piratorycoronavirus(BRCV)orbovineentericcorowithBCVinfectionwasobserved.naviru
6、s(BECV)was37/224(17%)and48/223(22%),AlthoughBCVinfectsepithelialcellsintheintesti-respectively.Somecattle(25/46,45%)shedBECVnalandrespiratorytractsofcalves,12-16theprevalenceofandBRCV.Therewere25/29(86%)cattlepositiveforentericinfectionsattributabletoBCV,theassociationBECVthatshedBRCV,butonly1/27(
7、4%)cattleneg-betweensheddingofBCVviatherespiratorytractandativetoBECVshedBRCV.Twenty-sevenof48(56%)entericroutes,andtherateofseroconversiontoBCVpairednasalswabspecimensandfecalsamplespos-itiveforBECVwerepositivef
