11/03/2015 LARYNGOTRACHEITISDiseasesofPoultryThePoultrySite

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BacterialDiseasesESCHERICHIACOLIINFECTIONSSALMONELLOSESPARATYPHOIDINFECTIONSFOWLCHOLERARIEMERELLAANATIPESTIFERINFECTIONSMYCOPLASMANECROTICENTERITISCHOLANGIOHEPATITISINBROILERCHICKENSGANGRENOUSDERMATITISBOTULISMAVIANTUBERCULOSIS

ViralDiseasesVIRALINCLUSIONBODYHEPATITISHAEMORRHAGICENTERITISOFTURKEYSEGGDROPSYNDROME1976ADENOVIRUSGROUPIASSOCIATEDINFECTIONSINFECTIOUSBURSALDISEASE(GUMBORO)INFECTIOUSBRONCHITIS(IB)LARYNGOTRACHEITISSWOLLENHEADSYNDROMEINFECTIOUSENCEPHALOMYELITISNEWCASTLEDISEASEFOWLPOXREOVIRUSINFECTIONS

NeoplasticDiseasesinPoultryVIRUSINDUCEDNEOPLASTICDISEASESMAREK'SDISEASELYMPHOIDLEUKOSISMYELOCYTOMATOSISERYTHROBLASTOSISADENOCARCINOMATOSIS

ParasiticDiseasesCOCCIDIOSISHISTOMONOSISASCARIDIOSISRAILLIETINOSISKNEMIDOKOPTOSIS

MycosesandMycotoxicosesASPERGILLOSISASPERGILLUSGRANULOMATOUSDERMATITISAFLATOXICOSISCANDIDIASISFUSARIOTOXICOSES

DeficiencyDiseasesVITAMINB2DEFICIENCYVITAMINBiDEFICIENCYVITAMINEDEFICIENCYFATTYLIVERHAEMORRHAGICSYNDROMESLIPPEDTENDON(PEROSIS)

OtherPULMONARYHYPERTENSION(ASCITIS)SYNDROMEINBROILERCHICKENSAMYLOIDOSISDEEPPECTORALMYOPATHYRUPTUREOFTHEGASTROCNEMIUSTENDONINBROILERBREEDERSCAGELAYERFATIGUEDYSCHONDROPLASIATHYPERKERATOSIS

LARYNGOTRACHEITIS

232.Laryngotracheitis (LT) is a viral infection in hens, pheasants and peacockscharacterized by catarrhal haemorrhagic to fibrinous inflammation of the respiratorytract.Itismanifestedinlaryngotrachealandconjunctivalform.Inthelaryngotrachealform,suffocation,ralesandcoughareobserved.Theheadandtheneckarestronglyextendedforwardandupwardduringinspiration.

233.mucouscoatsof the larynxand the tracheaare catarrhally haemorrhagically tofibrinously inflamed.Most outbreaks are encountered between the age of 4 and 14weeksalthough thediseaseaffects fowlofanyage.LT iscausedbyaherpesvirusthatisrelativelyresistant.

234.Haemorrhagic laryngotracheitis. The morbidity rate of LT reaches 5070% andthe death rate: 1020%. Often, it goes on as a complicated infection after theinvolvementofE.coli,St.aureus,M.gallisepticumetc.

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DiseasesofPoultryByIvanDinev,DVM,PhD

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11/03/2015 LARYNGOTRACHEITISDiseasesofPoultryThePoultrySite

http://www.thepoultrysite.com/publications/6/diseasesofpoultry/196/laryngotracheitis 2/2

GOUTHYPERANDROGENISMINBROILERCHICKENSEFFECTOFSTICKYWILLY(GALIUMAPARINE)SEEDSONHEALTHYSTATUSANDPRODUCTIONTRAITSINBROILERCHICKENSGIZZARDIMPACTIONINTURKEYPOULTSROUNDHEARTINTURKEYS(DILATEDCARDIOMYOPATHY)ACUTESELENIUMINTOXICATIONACUTEPROPANEBUTANEINTOXICATIONSPONTANEOUSRUPTUREOFTHECAUDIALRENALARTERYINTURKEYSSUBCUTANEOUSEMPHYSEMAGASTROINTESTINALIMPACTIONMALFORMATIONS

235.Insomecases,castsofhaemorrhagicorfibrinousexudateareformedthatcouldalmost completely obturate the larynx and the trachea. Source of the infection aresickandconvalescentbirds,thelatterbeingprolongedcarriersofthevirus(upto12years).Withthisregard,acertainstationarityisobserved.

236.In the conjunctival form of LT, wet eyes, tear secretion and oedema ofinfraorbital sinuses are observed, especially in a complicated infection. The typicalclinical andmorphological signs are sufficient to assume the presence of LT. Thediagnosis is confirmed with the detection of intranuclear inclusion bodies in thetrachea throughout the histological study in the early stages of the disease,serological studies (VN, ELISA) etc. LT should be differentiated from IB, SHS,M.synoviae infections etc. Premises, contamined with the LT virus, should be freed,cleansed, disinfected and occupied again after 5 6 weeks. The vaccination ofunaffectedbirdsandthesefromotherpremisesoftheinfectedfarmcouldprotectandstopsubsequentoutbreaks.

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