title: Utilization of lactose and presence of the phospho-β-galactosidase (lacG) gene in Lactococcus garvieae isolates from different sources.
abstract: This study evaluates the utilization of lactose (Lac) and the presence of the phospho-β-galactosidase (lacG) gene as markers for distinguishing between fish (Lac-/lacG-) and dairy isolates (Lac+/lacG+) of Lactococcus garvieae, using a panel of L. garvieae isolates from different sources. None of the fish isolates produced acid from lactose (Lac-), however Lac-/lacG- isolates were observed in pigs, cows, birds and humans. Most of the dairy isolates (77.8%) were Lac+/lacG+, but some dairy isolates did not produce acid from this sugar. Data in the present study show that the ability to metabolize lactose and the presence of the lacG gene are heterogeneously scattered among L. garvieae isolates of different sources. Therefore, the use of these criteria as markers to differentiate between L. garvieae isolates of dairy and fish origin should be considered with caution.
authors.affiliation: Department of Animal Health, Faculty of Veterinary Science, Complutense University, 28040 Madrid, Spain.
authors.forename: Mónica
authors.initials: M
authors.lastname: Aguado-Urda
authors.forename: M Teresa
authors.initials: MT
authors.lastname: Cutuli
authors.forename: M Mar
authors.initials: MM
authors.lastname: Blanco
authors.forename: Carmen
authors.initials: C
authors.lastname: Aspiroz
authors.forename: José L
authors.initials: JL
authors.lastname: Tejedor
authors.forename: José F
authors.initials: JF
authors.lastname: Fernández-Garayzábal
authors.forename: Alicia
authors.initials: A
authors.lastname: Gibello
mesh_terms: D000818:Animals; D016470:Bacteremia / Q000382:microbiology; D001437:Bacteriuria / Q000382:microbiology; D002417:Cattle; D003611:Dairy Products / Q000382:microbiology*; D005399:Fishes / Q000382:microbiology*; D005618:Fresh Water / Q000382:microbiology; D006801:Humans; D017045:Lactococcus / Q000235:genetics* / Q000302:isolation & purification; D007785:Lactose / Q000378:metabolism*; D012722:Sewage / Q000382:microbiology; D012867:Skin / Q000382:microbiology; D001616:beta-Galactosidase / Q000235:genetics*
chemical_list: D012722:Sewage; D001616:beta-Galactosidase; D007785:Lactose