The incidence, numbers and types of Listeria monocytogenes isolated from farm bulk tank milks.
Bulk tank milk from 160 producers was tested for Listeria monocytogenes at three monthly intervals over 1 year. Twenty-five producers were positive, most on a single occasion, only seven were positive on three or more of the four samplings. Listeria monocytogenes numbers were low, usually < 1 ml-1, the highest was 35 ml-1. All isolates were serotype 1, the use of multilocus enzyme electrophoresis on representative isolates gave nine different electrophoretic types, two have been associated with listeriosis in humans or animals, a further two had only been isolated from one other source (silage or faeces), while the majority (5) were unique to milk.
Fenlon
D R
DR
Microbiology Unit, SAC-Aberdeen, UK.
Stewart
T
T
Donachie
W
W
D000818:Animals; D015169:Colony Count, Microbial; D005513:Food Inspection; D008089:Listeria monocytogenes / Q000145:classification / Q000302:isolation & purification*; D008892:Milk / Q000382:microbiology*