SENSITIVITY OF CULTURE ORNITHOBACTERIUM RHINOTRACHEALE TO ANTIBIOTICS ANTIBIOTICS
Abstract
Ornitobakterialnyrhinotracheitisreferstothegroupofrespiratorydisea ses,whichcurrentlyisoneofthemajorpoultryindustryproblemssinceleadtosignificantec onomiclossesduetolostproductivityincommercialandreproductivestage,deterioration ofthequalityofeggsanddecreaseincrementsandincreasedcullingofbroilers.Thecause ofthesediseasesisassociatedwiththeactionofvariousfactors,usuallymutuallyreinforci ngeachother. ThediseasehasbecomewidespreadinEurope, America, AsiaandAfrica. A largenumberofspeciesofpathogens, rapiddevelopmentofresistancetoantibiotics, difficultiesindiagnosis– thesefactorsmakeitdifficultforthebirdtocureforthisdisease. Isolationofthepathogenbyclassicalbacteriologicalmethodsisanextremelycomp lexprocess, andthereactionofsensitivitytoantibioticsof a circulatingspeciestakes a longtimeanddoesnotalwaysgivethedesiredresult. Butthechoiceoftherightchemotherapeuticdrugforfightingthepathogenisthemaincondi tionforsuccessfultreatmentandtheguaranteeofthewell-beingoftheherd. Toconductresearch, pathologicalmaterialfrom a clinicallyillpoultrywasselected, withsignsofinvolvementofrespiratoryorgans.
ThecausativeagentofOrnitobacteriumrinotrahealewasisolatedbybacteriologicalmeth odsofinvestigation. Forthediagnosis, moleculargeneticstudiesofwashingsfromthetrachea, usingthe PCR method, wereused. SensitivitytoantibioticsofOrnitobacteriumrinotrahealeculture, isolatedfrombroilerturkeys, wasdeterminedby a disk-diffusionmethod. Identificationoftheculturewasconfirmedbybiochemicaltests.Tosetupasensitivityr esponse,discswithantibioticswereused.Whenanalyzingtheantibioticsusceptibilit yofisolatedstrainsofmicroorganisms,optimalvaluesofthediameterofgrowthretard ation,characterizingthesensitivitylevelsforeachantibiotic,weretakenintoaccount. Accordingtoourstudies,thecirculatingtypeofagentappearedtobesensitivetoenrofl oxacin (27.0 mm zoneofgrowthinhibition), oxytetracycline (25.5 mm), amoxicillin (24.0 mm), doxycycline (22.3 mm), tylosin, andflortenipolutiamulin– thezoneofgrowthretardationof 22.0, 21.5 and 18 mm, respectively. Keywords: ornithobacteriosis, Ornithobacteriumrhinotracheale, tilmicosin, enrofloxacin, ORT
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