Polymerase chain reaction identification of Bacillus sporothermodurans from dairy sources.
OBJECTIVE
A new polymerase chain reaction (PCR) method for the identification of Bacillus sporothermodurans strains from sterilized or ultrahigh temperature-treated milk and milk products and from other non-milk sources and environments, including the dairy farm.


RESULTS
Two strains from raw milk and feed concentrate could be allocated to B. sporothermodurans based on 16S rDNA sequencing and DNA-DNA hybridization results. Two specific PCR primers were derived from the 16S rRNA gene of B. sporothermodurans.


CONCLUSIONS
The PCR identification method was validated using a collection of B. sporothermodurans strains from different sources and on a large collection of dairy and non-dairy Bacillus spp. and other relevant taxa.


CONCLUSIONS
This PCR method was used as a screening method for strains with very heat-resistant endospores, isolated at the dairy farm level after heat treatment for 30 min at 100 degrees C. Seventeen strains isolated at the dairy farm were identified as B. sporothermodurans. They originated mainly from feed concentrate and also from soy, pulp and silage. The PCR identification method described here can, therefore, contribute to a better understanding of the route by which B. sporothermodurans contaminates raw and/or heat-treated milk.
Scheldeman
P
P
Centre for Agricultural Research - Ghent, Department of Animal Product Quality and Transformation Technology (DVK), Melle, Belgium. P.Scheldeman@clo.fgov.be
Herman
L
L
Goris
J
J
De Vos
P
P
Heyndrickx
M
M
D000821:Animal Feed / Q000382:microbiology; D000818:Animals; D001407:Bacillus / Q000737:chemistry / Q000145:classification* / Q000235:genetics* / Q000502:physiology; D001483:Base Sequence; D002417:Cattle; D004275:DNA, Ribosomal / Q000032:analysis; D003611:Dairy Products / Q000382:microbiology*; D003612:Dairying; D005227:Fatty Acids / Q000032:analysis; D006358:Hot Temperature; D008892:Milk / Q000382:microbiology; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D016133:Polymerase Chain Reaction / Q000379:methods*; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D013171:Spores, Bacterial / Q000502:physiology; D013242:Sterilization / Q000379:methods
D004275:DNA, Ribosomal; D005227:Fatty Acids; D012336:RNA, Ribosomal, 16S