title: Epidemiological study on Mycoplasma synoviae infection in layers.
abstract: Mycoplasma synoviae infection occurs worldwide in commercial poultry flocks and may result in severe economic losses. The prevalence of this mycoplasma in standard layers older than 60 weeks was studied in a French department and the characteristics of infected or free flocks were compared. The genomic profiles of isolates from 36 infected flocks were studied by pulsed-field gel electrophoresis and random amplified polymorphic DNA methods in order to investigate possible routes of transmission. The minimum inhibitory concentrations of antibiotics were determined. Results showed that infection was more frequent in multi-age farms. Egg production and mortality of infected flocks were respectively lower and higher than in non-infected flocks but the differences were not statistically significant. The genomic profiles of isolates were quite homogeneous, a feature which does not facilitate the understanding of routes of transmission. All isolates were susceptible to tetracyclines, macrolides (except erythromycin), spectinomycin and fluoroquinolones.
authors.affiliation: Unité Mycoplasmologie Bactériologie, AFSSA site de Ploufragan, BP 53, F-22440 Ploufragan, France.
authors.forename: Fabienne
authors.initials: F
authors.lastname: Dufour-Gesbert
authors.forename: Alexandra
authors.initials: A
authors.lastname: Dheilly
authors.forename: Corinne
authors.initials: C
authors.lastname: Marois
authors.forename: Isabelle
authors.initials: I
authors.lastname: Kempf
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D002645:Chickens; D017931:DNA Primers / Q000737:chemistry; D016521:Electrophoresis, Gel, Pulsed-Field / Q000662:veterinary; D005260:Female; D005602:France / Q000453:epidemiology; D016680:Genome, Bacterial / Q000235:genetics; D008826:Microbial Sensitivity Tests / Q000379:methods / Q000662:veterinary; D009175:Mycoplasma Infections / Q000453:epidemiology / Q000635:transmission / Q000662:veterinary*; D045805:Mycoplasma synoviae / Q000187:drug effects / Q000235:genetics* / Q000302:isolation & purification*; D011201:Poultry Diseases / Q000453:epidemiology* / Q000382:microbiology* / Q000635:transmission; D015995:Prevalence; D019105:Random Amplified Polymorphic DNA Technique / Q000662:veterinary
chemical_list: D000900:Anti-Bacterial Agents; D017931:DNA Primers